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Kilometre

Kilometre

A kilometre (American spelling: kilometer), symbol: km is a unit of length in the metric system equal to 1000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet. Slang terms for kilometre include "klick" (sometimes spelt "click" or "klik") and "kay" (or "k"). All these slang terms can also refer to kilometres per hour.

Metric system

:Main articles: Metric system and Metre Like the kilometre, all units of length in the metric system are based on the metre, by adding an SI prefix that stands for a power of ten, such as hecto for one hundred to form hectometre (= 0.1 kilometre) or mega for one million to form megametre (= 1,000 kilometre). The metre is not only the basis for all units of length in the metric system, but also of units of area (the square metre) and volume (the cubic metre). This extends to the kilometre, so one can have square and cubic kilometres. Unicode has symbols for "km" (㎞), for square kilometre (㎢) and for cubic kilometre (㎦); however, they are useful only in CJK texts, where they are equal in size to one Chinese character.

Pronunciation

In theory, the pronunciation of the word kilometre should have the stress placed on the first syllable, in line with other metric prefixes (as in kilogram, kilojoule and, analogous, kilobyte). However, pronunciation with the stress on the second syllable is usual in English.

American English

American English (AmE) is the dialect of the English language used mostly in the United States of America. Crystal (1997) estimates that approximately two thirds of native speakers of English live in the United States. American English is also sometimes called United States English or U.S. English.

History

English was inherited from British colonization. The first wave of English-speaking immigrants was settled in North America in the 17th century. In that century, there were also speakers in North America of the Dutch, French, German, myriad Native American, Spanish, Swedish, Scots, Welsh, Irish, Scottish Gaelic and Finnish languages.

Phonology

In many ways, compared to British English, American English is conservative in its phonology. The conservatism of American English is largely the result of the fact that it represents a mixture of various dialects from the British Isles. Dialect in North America is most distinctive on the East Coast of the continent; this is largely because these areas were in contact with England, and imitated prestigious varieties of British English at a time when those varieties were undergoing changes. The interior of the country was settled by people who were no longer closely connected to England, as they had no access to the ocean during a time when journeys to Britain were always by sea. As such the inland speech is much more homogeneous than the East Coast speech, and did not imitate the changes in speech from England. East Coast-influenced non-rhotic pronunciations may be found among blacks throughout the country.]]Most North American speech is rhotic, as English was in most places in the 17th century. Rhoticity was further supported by Hiberno-English, Scottish English, and West Country English. In most varieties of North American English, the sound corresponding to the letter "R" is a retroflex semivowel rather than a trill or a tap. The loss of syllable-final r in North America is confined mostly to the accents of eastern New England, New York City and surrounding areas, South Philadelphia, and the coastal portions of the South. Dropping of syllable-final r sometimes happens in natively rhotic dialects if r is located in unaccented syllables or words and the next syllable or word begins in a consonant. In England, lost 'r' was often changed into (schwa), giving rise to a new class of falling diphthongs. Furthermore, the 'er' sound of (stressed) fur or (unstressed) butter, which is represented in IPA as stressed or unstressed is realized in American English as a monophthongal r-colored vowel. This does not happen in the non-rhotic varieties of North American speech. Some other British English changes in which most North American dialects do not participate:
- The shift of to (the so-called "broad A") before alone or preceded by . This is the difference between the British Received Pronunciation and American pronunciation of bath and dance. In the United States, only linguistically conservative eastern-New-England speakers took up this innovation.
- The shift of intervocalic to glottal stop , as in for bottle. This change is not universal for British English (and in fact is not considered to be part of Received Pronunciation), but it does not occur in most North American dialects. Newfoundland English and the dialect of New Britain, Connecticut are notable exceptions. On the other hand, North American English has undergone some sound changes not found in Britain, at least not in standard varieties. Many of these are instances of phonemic differentiation and include
- The merger of and , making father and bother rhyme. This change is nearly universal in North American English, occurring almost everywhere except for parts of eastern New England, like the Boston accent.
- The replacement of the lot vowel with the strut vowel in what, was, of, from, everybody, nobody, somebody, anybody, because, and in some dialects want.
- The merger of and . This is the so-called cot-caught merger, where cot and caught are homophones. This change has occurred in eastern New England, in Pittsburgh and surrounding areas, and from the Great Plains westward.
- Vowel merger before intervocalic . Which (if any) vowels are affected varies between dialects.
- The merger of and after palatals in some words, so that cure, pure, mature and sure rhyme with fir in some speech registers for some speakers.
- Dropping of after alveolar consonants so that new, duke, Tuesday, suit, resume, lute are pronounced , , , , , .
- Æ-tensing in environments that vary widely from accent to accent. In some accents, particularly those from Philadelphia to New York City, and can even contrast sometimes, as in Yes, I can vs. tin can .
- Laxing of , and to , and before , causing pronunciations like , and for pair, peer and pure.
- The flapping of intervocalic and to alveolar tap before reduced vowels. The words ladder and latter are mostly or entirely homophonous, possibly distinguished only by the length of preceding vowel. For some speakers, the merger is incomplete and 't' before a reduced vowel is sometimes not tapped following or when it represents underlying 't'; thus greater and grader, and unbitten and unbidden are distinguished. Even among those words where and are flapped, words that would otherwise be homophonous are, for some speakers, distinguished if the flapping is immediately preceded by the diphthongs or ; these speakers tend to pronounce writer with and rider with . This is called Canadian raising; it is general in Canadian English, and occurs in some northerly versions of American English as well (often just applying to the diphthong , but not to ).
- Both intervocalic and may be realized as or , making winter and winner homophones. This does not occur when the second syllable is stressed, as in entail.
- The pin-pen merger, by which is raised to before nasal consonants, making pairs like pen/pin homophonous. This merger originated in Southern American English but is now widespread in the Midwest and West as well. Some mergers found in most varieties of both American and British English include:
- The horse-hoarse merger of the vowels and before 'r', making pairs like horse/hoarse, corps/core, for/four, morning/mourning etc. homophones.
- The wine-whine merger making pairs like wine/whine, wet/whet, Wales/whales, wear/where etc. homophones. Many older varieties of southern and western American English still keep these distinct, but the merger appears to be spreading.

Differences in British English and American English

Main article: American and British English differences American English has both spelling and grammatical differences from British English (or Commonwealth English), some of which were made as part of an attempt to rationalize the English spelling used by British English at the time. Unlike many 20th century language reforms (for example, Turkey's alphabet shift, Norway's spelling reform) the American spelling changes were not driven by government, but by textbook writers and dictionary makers. The first American dictionary was written by Noah Webster in 1828. At the time America was a relatively new country and Webster's particular contribution was to show that the region spoke a different dialect from Britain, and so he wrote a dictionary with many spellings differing from the standard. Many of these changes were initiated unilaterally by Webster. Webster also argued for many "simplifications" to the idiomatic spelling of the period. Somewhat ironically, many, although not all, of his simplifications fell into common usage alongside the original versions, resulting in a situation even more confused than before. Many words are shortened and differ from other versions of English. Spellings such as center are used instead of centre in other versions of English. Conversely, American English sometimes favors words that are morphologically more complex, whereas British English uses clipped forms, such as AmE transportation and BrE transport or where the British form is a back-formation, such as AmE burglarize and BrE burgle (from burglar).

English words that arose in the U.S.

A number of words that arose in the United States have become common, to varying degrees, in English as it is spoken internationally. Although its origin is disputed, the most famous word is probably OK, which is sometimes used in other languages as well. Other American introductions include "belittle," "gerrymander" (from Elbridge Gerry), "blizzard", "teenager", and many more.

English words obsolete outside the U.S.

A number of words that originated in the English of the British Isles are still in everyday use in North America, but are no longer used in most varieties of British English. The most conspicuous of these words are fall, the season; to quit, as in "to cease an activity" (as opposed to "to leave a location" as still used in most other Anglophone countries); and gotten as a past participle of get. Americans are more likely than Britons to name a stream whose breadth or volume is judged insufficient for it to be a river or a creek. The word diaper goes back at least to Shakespeare, and usage was maintained in the U.S. and Canada, but was replaced in the British Isles with nappy. Some of these words are still used in various dialects of the British Isles, but not in formal standard British English. Many of these older words have cognates in Lowland Scots. The subjunctive mood is livelier in North American English than it is in British English; it appears in some areas as a spoken usage, and is considered obligatory in more formal contexts in American English. British English has a strong tendency to replace subjunctives with auxiliary verb constructions.

Regional differences

Main article: American English regional differences Spoken American English is not homogeneous throughout the country, and various regional and ethnic variants exist. These differences affect both pronunciation and the lexicon, and can make one accent a little difficult for speakers of another accent to understand. General American is the name given to any American accent that is relatively free of noticeable regional influences. It enjoys high prestige among Americans, but is not a standard accent in the way that Received Pronunciation is in England.

References

External links

- [http://www.pbs.org/speak/ Do You Speak American]: PBS special
- [http://cfprod01.imt.uwm.edu/Dept/FLL/linguistics/dialect/ Dialect Survey] of the United States, by Bert Vaux et al., Harvard University. The answers to various questions about pronunciation, word use etc. can be seen in relationship to the regions where they are predominant.
- [http://www.ling.upenn.edu/phono_atlas/home.html Phonological Atlas of North America] at the University of Pennsylvania
- [http://students.csci.unt.edu/~kun Guide to Regional English Pronunciation] includes working versions of the Telsur Project maps from the Phonologial Atlas site
- [http://www.peak.org/~jeremy/dictionary/ The American•British British•American Dictionary]
- [http://classweb.gmu.edu/accent/ Speech Accent Archive]
- [http://www.world-english.org/ World English Organization]
- [http://www.esuus.org English Speaking Union of the United States]
- [http://canadianenglish1.narod.ru American Canadian British English Lexical Differences In One Table]
- [http://australianenglish1.narod.ru Australian American British English Lexical Differences In One Table And More]
- [http://www.englisch-hilfen.de/en/words_list/british_american.htm British, American, Australian English - Lists and Online Exercises]
- [http://www.globalenglishsalon.com/ Listen to spoken American English (midwest

Length

:This article is about the concept and measurement of distance. For usage in cricket, see line and length. In general English usage, length (symbols: l, L) is but one particular instance of distance – an object's length is how long the object is – but in the physical sciences and engineering, the word length is in some contexts used synonymously with "distance". Height is vertical distance; width (or breadth) is a lateral distance; an object's width is less than its length. No one speaks of "the length from here to Alpha Centauri", but rather of "the distance from here to Alpha Centauri," but when one speaks of distance more abstractly, one says "A kilometre or a mile, is a unit of length" or "...of distance", and the two statements are synonymous. Likewise, a mountain might be a mile in height. Length is the metric of one dimension of space. The metric of space itself is volume, or (length)³. Length is commonly considered to be one of the fundamental units, meaning that it cannot be defined in terms of other dimensions. However, a set of units can be constructed where units of length can be derived from fundamental physical constants - see Planck units and Planck length. Colloquially length sometimes refers to duration, especially when used in context of music.

Units of length(SI)

The SI unit of Length is the metre (U.S. spelling: meter), from which can be derived:from the regular basis of the foundation of the whole world
- centimetre
- kilometre

Other units of length

The Imperial and US customary units of length

- inch
- foot
- yard
- mile

Units are used in astronomy

- Astronomical unit
- Light year
- Parsec

External links

- [http://www.unitconversion.org/unit_converter/length.html Length Converter: convert between units of length, such as meter, yard, mile, and so on]
- [http://www.unitconversion.org/unit_converter/length-v.html Length Conversion table: convert selected unit to all other units of length]
- [http://calc.skyrocket.de/en/ Online Unit Converter - Conversion of many different units]
- Category:Norm ko:길이 ja:長さ

Metre

:This article is about the unit of length. For other uses of metre or meter, see meter (disambiguation). The metre (Commonwealth English) or meter (American English) (symbol: m) is the SI base unit of length. It is defined as the length of the path travelled by light in absolute vacuum during a time interval of 1/299,792,458 of a second. Adding SI prefixes to metre creates multiples and submultiples; for example kilometre (1000 metres; kilo- = 1000) and millimetre (one thousandth of a metre; milli- = 1 / 1 000).

Conversions

1 metre is equivalent to:
- exactly 1/0.9144 yards (approximately 1.0936 yards)
- exactly 1/0.3048 feet (approximately 3.2808 feet)
- exactly 10000/254 inches (approximately 39.370 inches)

History

The word metre is from the Greek metron (μετρον), "a measure" via the French mètre. Its first recorded usage in English is from 1797. In the 18th century, there were two favoured approaches to the definition of the standard unit of length. One suggested defining the metre as the length of a pendulum with a half-period of one second. The other suggested defining the metre as one ten-millionth of the length of the earth's meridian along a quadrant (one-fourth the polar circumference of the earth). In 1791, the French Academy of Sciences selected the meridional definition over the pendular definition because of the slight variation of the force of gravity over the surface of the earth, which affects the period of a pendulum. In 1793, France adopted the metre, with this definition, as its official unit of length. Although it was later determined that the first prototype metre bar was short by a fifth of a millimetre due to miscalculation of the flattening of the earth, this length became the standard. So, the circumference of the Earth through the poles is approximately forty million metres. Earth in a vacuum.]] In the 1870s and in light of modern precision, a series of international conferences were held to devise new metric standards. The Metre Convention (Convention du Mètre) of 1875 mandated the establishment of a permanent International Bureau of Weights and Measures (BIPM: Bureau International des Poids et Mesures) to be located in Sèvres, France. This new organisation would preserve the new prototype metre and kilogram when constructed, distribute national metric prototypes, and would maintain comparisons between them and non-metric measurement standards. This organisation created a new prototype bar in 1889 at the first General Conference on Weights and Measures (CGPM: Conférence Générale des Poids et Mesures), establishing the International Prototype Metre as the distance between two lines on a standard bar of an alloy of ninety percent platinum and ten percent iridium, measured at the melting point of ice. In 1893, the standard metre was first measured with an interferometer by Albert A. Michelson, the inventor of the device and an advocate of using some particular wavelength of light as a standard of distance. By 1925, interferometry was in regular use at the BIPM. However, the International Prototype Metre remained the standard until 1960, when the eleventh CGPM defined the metre in the new SI system as equal to 1,650,763.73 wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-86 atom in a vacuum. The original international prototype of the metre is still kept at the BIPM under the conditions specified in 1889. To further reduce uncertainty, the seventeenth CGPM of 1983 replaced the definition of the metre with its current definition, thus fixing the length of the metre in terms of time and the speed of light: :The metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second. Note that this definition exactly fixes the speed of light in a vacuum at 299,792,458 metres per second. Definitions based on the physical properties of light are more precise and reproducible because the properties of light are considered to be universally constant.

Timeline of definition

- 1790 May 8 — The French National Assembly decides that the length of the new metre would be equal to the length of a pendulum with a half-period of one second.
- 1791 March 30 — The French National Assembly accepts the proposal by the French Academy of Sciences that the new definition for the metre be equal to one ten-millionth of the length of the earth's meridian along a quadrant (one-fourth the polar circumference of the earth).
- 1795 — Provisional metre bar constructed of brass.
- 1799 December 10 — The French National Assembly specifies that the platinum metre bar, constructed on 23 June 1799 and deposited in the National Archives, as the final standard.
- 1889 September 28 — The first CGPM defines the length as the distance between two lines on a standard bar of an alloy of platinum with ten percent iridium, measured at the melting point of ice.
- 1927 October 6 — The seventh CGPM adjusts the definition of the length to be the distance, at 0 °C, between the axes of the two central lines marked on the prototype bar of platinum-iridium, this bar being subject to one standard atmosphere of pressure and supported on two cylinders of at least one centimetre diameter, symmetrically placed in the same horizontal plane at a distance of 571 millimetres from each other.
- 1960 October 20 — The eleventh CGPM defines the length to be equal to 1,650,763.73 wavelengths in vacuum of the radiation corresponding to the transition between the 2p¹⁰ and 5d⁵ quantum levels of the krypton-86 atom.
- 1983 October 21 — The seventeenth CGPM defines the length to be distance travelled by light in vacuum during a time interval of 1/299 792 458 of a second.

External links

- [http://www.unitconversion.org/unit_converter/length.html?unit=meter&value=1 Length Converter: convert metre to other units, such as yard, mile, and so on]
- [http://physics.nist.gov/cuu/Units/meter.html History of the metre at the U.S. National Institute of Standards and Technology (NIST)]
- [http://www.mel.nist.gov/div821/museum/timeline.htm Timeline of history of the metre at the NIST]
- [http://www1.bipm.org/en/scientific/length/ Bureau International des Poids et Measures - Lengths] Category:SI base units Category:Units of length ko:미터 ms:Meter ja:メートル simple:Metre th:เมตร

Greek language

Greek (Greek Ελληνικά, IPA – "Hellenic") is an Indo-European language with a documented history of 3,500 years. Today, it is spoken by 15 million people in Greece, Cyprus, the former Yugoslavia, particularly The Former Yugoslav Republic of Macedonia, Bulgaria, Albania and Turkey. There are also many Greek emigrant communities around the world, such as those in Melbourne, Australia which is the third-largest Greek-populated city in the world, after Athens and Thessaloniki. Greek has been written in the Greek alphabet, the first true alphabet, since the 9th century B.C. and before that, in Linear B and the Cypriot syllabaries. Greek literature has a long and rich tradition.

History

This article does not cover the reconstructed history of Greek prior to the use of writing. For more information, see main article on Proto-Greek language. Greek has been spoken in the Balkan Peninsula since the 2nd millennium BC. The earliest evidence of this is found in the Linear B tablets dating from 1500 BC. The later Greek alphabet (q.v.) is unrelated to Linear B, and was derived from the Phoenician alphabet (abjad); with minor modifications, it is still used today. Greek is conventionally divided into the following periods:
- Mycenean Greek: the language of the Mycenean civilisation. It is recorded in the Linear B script on tablets dating from the 16th century BC onwards.
- Classical Greek (also known as Ancient Greek): In its various dialects was the language of the Archaic and Classical periods of Greek civilisation. It was widely known throughout the Roman empire. Classical Greek fell into disuse in western Europe in the Middle Ages, but remained known in the Byzantine world, and was reintroduced to the rest of Europe with the Fall of Constantinople and Greek migration to Italy.
- Hellenistic Greek (also known as Koine Greek): The fusion of various ancient Greek dialects with Attic (the dialect of Athens) resulted in the creation of the first common Greek dialect, which gradually turned into one of the world's first international languages. Koine Greek can be initially traced within the armies and conquered territories of Alexander the Great, but after the Hellenistic colonisation of the known world, it was spoken from Egypt to the fringes of India. After the Roman conquest of Greece, an unofficial diglossy of Greek and Latin was established in the city of Rome and Koine Greek became a first or second language in the Roman Empire. Through Koine Greek it is also traced the origin of Christianity, as the Apostles used it to preach in Greece and the Greek-speaking world. It is also known as the Alexandrian dialect, Post-Classical Greek or even New Testament Greek (after its most famous work of literature).
- Medieval Greek: The continuation of Hellenistic Greek during medieval Greek history as the official and vernacular (if not the literary nor the ecclesiastic) language of the Byzantine Empire, and continued to be used until, and after the fall of that Empire in the 15th century. Also known as Byzantine Greek.
- Modern Greek: Stemming independently from Koine Greek, Modern Greek usages can be traced in the late Byzantine period (as early as 11th century). Two main forms of the language have been in use since the end of the medieval Greek period: Dhimotikí (Δημοτική), the Demotic (vernacular) language, and Katharévousa (Καθαρεύουσα), an imitation of classical Greek, which was used for literary, juridic, and scientific purposes during the 19th and early 20th centuries. Demotic Greek is now the official language of the modern Greek state, and the most widely spoken by Greeks today. It has been claimed that an "educated" speaker of the modern language can understand an ancient text, but this is surely as much a function of education as of the similarity of the languages. Still, Koinē , the version of Greek used to write the New Testament and the Septuagint, is relatively easy to understand for modern speakers. Greek words have been widely borrowed into the European languages: astronomy, democracy, philosophy, thespian, etc. Moreover, Greek words and word elements continue to be productive as a basis for coinages: anthropology, photography, isomer, biomechanics etc. and form, with Latin words, the foundation of international scientific and technical vocabulary. See English words of Greek origin, and List of Greek words with English derivatives.

Classification

Greek is an independent branch of the Indo-European language family. The ancient languages which were probably most closely related to it, Ancient Macedonian language (which may be regarded as a dialect of Greek) and Phrygian, are not well enough documented to permit detailed comparison. Among living languages, Armenian seems to be the most closely related to it.

Geographic distribution

Modern Greek is spoken by about 15 million people mainly in Greece and Cyprus. There are also Greek-speaking populations in Georgia, Ukraine, Egypt, Turkey, Albania, Former Yugoslav Republic of Macedonia and Southern Italy. The language is spoken also in many other countries where Greeks have settled, including Armenia, Australia, Austria, Belgium, Bulgaria, Canada, Denmark, France, Germany, Netherlands, Sweden, United Kingdom, and the United States.

Official status

Greek is the official language of Greece where it is spoken by about 99.5% of the population. It is also, alongside Turkish, the official language of Cyprus. Due to the membership of Greece and Cyprus, Greek is one of the 20 official languages of the European Union.

Phonology

This section generally describes the post-Classic phonology of the Greek language. :All phonetic transcriptions in this section use the International Phonetic Alphabet

Vowel sounds

Greek has 5 vowel sounds, all phonemic:

Mile

A mile is a unit of distance (or, in physics terminology, length) currently defined as 5,280 feet, 1,760 yards, or 63,360 inches. Today, one mile (often called "statute mile") is equal to about 1,609 m on land and one nautical mile to exactly 1,852 m at sea and in the air. The term has also been used to describe other lengths--see below for the details. Abbreviations for mile are "mi." in the U.S., and "ml" and "m" in the UK. The mile was first used by the Romans and originally denoted a distance of 1,000 (double) steps ("mille passuum" in Latin), which amounted, at approximately 0.75 m per (single) step, to 1,500 metres per mile. In modern usage, there are various miles:
- The statute mile, or more specifically
- The international mile is the one typically meant when the word mile is used without qualification. It is defined to be precisely 1,760 international yards (by definition, 0.9144 m each); it is therefore exactly 1,609.344 m. (1.609344 km) It is used in the United States and the United Kingdom as part of the Imperial system of units. The international mile is equivalent to 8 furlongs, or 80 chains, or 5,280 international feet.
- The U.S. survey mile is precisely equal to 5,280 U.S. survey feet or 6,336/3,937 km or, approximately 1,609.347 m. One international mile is precisely equal to 0.999 998 survey mile. The survey mile is used by the United States Public Land Survey System.
- The statute mile simply means "a mile of 5,280 feet", without specifying which foot is used. The term is therefore ambiguous.
- The obsolete Scottish and Irish miles, longer than the English (nautical mile) by about a half.
- The international nautical mile is defined to be exactly 1,852 m. It is used universally for aviation, naval and maritime purposes and originated from the geographical mile.
- In Norway and Sweden, a distance of 10 km is most commonly referred to as a mile or metric mile, see mil.
- In sports such as athletics and speedskating, the term metric mile is used to denote a distance of 1.5 km.
- The German mile was reckoned to be the 15th part of a degree (and thus about four nautical miles in length).
- The Danes, Swedes, and Hungarians had long miles, which were about a German mile and a half.
- The Dutch mile, was nearly the 19th part of a degree. The Polish mile was nearly equal to the Dutch mile.
- The Italian mile was a thousand paces of 5 Roman feet each (the Roman foot being one fifth of an inch less than the London foot). One mile is precisely 80 chains long. See Edmund Gunter.

Reference

[http://listserv.dartmouth.edu/scripts/wa.exe?A2=ind0108&L=nisus&T=0&F=&S=&P=42289 'Of Divers Measures'], in Laurence Echard, 1741, The Gazetteer's or Newsman's Interpreter, London: Ballard et al. (first published 1703)

External links

- [http://ts.nist.gov/ts/htdocs/230/235/appxc/appxc.htm NIST General Tables of Units of Measurement] Category:Ancient Rome Category:Units of length Category:Imperial units Category:Customary units in the United States ja:マイル simple:Mile

Foot (unit of length)

:For other uses, see Foot (disambiguation). A foot (plural: feet) is a non-SI unit of distance or length, measuring around a third of a metre. There are twelve inches in one foot and three feet in one yard. The international standard symbol for feet is ft (see ISO 31-1, Annex A). The standardization of weights and measures has left several different standard foot measures. The most commonly used foot today is the English foot, used in the United Kingdom and the United States and elsewhere, which is defined to be exactly 0.3048 metre. This unit is sometimes denoted with a prime (e.g. 30′ means 30 feet), often approximated by an apostrophe. Similarly, inches can be denoted by a double prime (often approximated by a quotation mark), so 6′ 2″ means 6 feet 2 inches. In addition to the current standard international foot, there is also a slightly different U.S. survey foot, used only in connection with surveys by the U.S. Coast and Geodetic Survey, it is defined as exactly 1200/3937 m (610 nm greater than 0.3048 m).[http://www.ngs.noaa.gov/PUBS_LIB/FedRegister/FRdoc59-5442.pdf] The foot as a measure was used in almost all cultures. The first known standard foot measure was from Sumeria, where a definition is given in a statue of Gudea of Lagash from around 2575 BC. The imperial foot was adapted from an Egyptian measure by the Greeks, with a subsequent larger foot being adopted by the Romans.

Etymology

The popular belief is that original standard was the length of a man's foot. The original measurement was from King Henry I, who had a foot 12 inches long; he wished to standardise the unit of measurement in England. The average foot length is about 9.4 inches (240 mm) for current Europeans. Approximately 996 out of 1000 British men have a foot that is less than 12 inches long. A plausible explanation for the missing inches is that the measure did not refer to a naked foot, but to the length of footwear. This is consistent with the measure being convenient for practical purposes such as on building sites etc. People almost always pace out lengths whilst wearing shoes or boots, rather than removing them and pacing barefoot.

External link

- http://www.onlineconversion.com/ from feet to international system
- http://www.knowledgedoor.com/1/Library_of_Units_and_Constants/Group_Index/foot_group.htm Foot Foot Foot Category:Human-based units of measure ja:フィート

Klick

Klick (sometimes spelled click, but that may also mean one second of arc) is a common military term meaning kilometre (or sometimes kilometres per hour). Its use became popular among soldiers in Vietnam during the 1960s, although veterans of the war recall its usage as early as the 1950s. Its origin is sometimes linked with the Australian army in Korea. The term is of unknown origin. It is most likely an example of condensed pronunciation or contraction of the term kilometre or possibly otomonopedic of the sound of a military compass's bezel ring, although other theories exist. The term is currently also used by civilians, particularly in Canada where road signs and car speedometers use kilometres.

External links

- [http://usmilitary.about.com/library/milinfo/faq/blklickdef.htm Alternative Theory]
- [http://www.randomhouse.com/wotd/index.pperl?date=19960719 Concise Definition] Category:Military slang

Kilometre per hour

]] Kilometre per hour (American spelling: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). The symbol is km/h or km·h⁻¹. It is often spoken and sometimes written as klicks or kays in slang usage. By definition, an object travelling at a speed of 1 km/h for an hour would move 1 kilometre.

Conversions

- 3.6 km/h ≡ 1 m·s⁻¹, the SI derived unit of speed, metre per second
- 1 km/h ≈ 0.27778 m/s
- 1 km/h ≈ 0.62137 mph ≈ 0.91134 feet per second

External links

- [http://www.ex.ac.uk/trol/scol/ccspeed.htm Conversion Calculator for Units of SPEED] Category:Units of velocity ja:キロメートル毎時

Metre

Conversions

1 metre is equivalent to:
- exactly 1/0.9144 yards (approximately 1.0936 yards)
- exactly 1/0.3048 feet (approximately 3.2808 feet)
- exactly 10000/254 inches (approximately 39.370 inches)

History

Timeline of definition

External links

Hectometre

Conversions

1 metre is equivalent to:
- exactly 1/0.9144 yards (approximately 1.0936 yards)
- exactly 1/0.3048 feet (approximately 3.2808 feet)
- exactly 10000/254 inches (approximately 39.370 inches)

History

Timeline of definition

External links

Length

Units of length(SI)

The SI unit of Length is the metre (U.S. spelling: meter), from which can be derived:from the regular basis of the foundation of the whole world
- centimetre
- kilometre

Other units of length

The Imperial and US customary units of length

- inch
- foot
- yard
- mile

Units are used in astronomy

- Astronomical unit
- Light year
- Parsec

External links

Area

:This article explains the meaning of area as a physical quantity. The article area (geometry) is more mathematical. See also area (disambiguation). Area is a quantity expressing the size of a part of a surface. Surface area is the summation of the areas of the exposed sides of an object.

Units

Units for measuring surface area include: :square metre = SI derived unit :are = 100 square metres :hectare = 10,000 square metres :square kilometre = 1,000,000 square metres :square megametre = 10¹² square metres Imperial units, as currently defined from the metre: :square foot (plural square feet) = 0.09290304 square metres. :square yard = 9 square feet = 0.83612736 square metres :square perch = 30.25 square yards = 25.2928526 square metres :acre = 160 square perches or 43,560 square feet = 4046.8564224 square metres :square mile = 640 acres = 2.5899881103 square kilometres Old European area units, still in used in some private matters (e.g. land sale advertisements) :square fathom = 3.5967 square metres :cadastral moon(acre) = 1600� square fathoms = 5755 square metres The article Orders of magnitude links to lists of objects of comparable surface area.

Useful formulas

- Area of a rectangle (and, in particular, a square): length × width
- Area of a triangle: ½ × base × height
- Area of a disk: π × r²
- Area of an ellipse: π × a × b
- Area of a sphere: 4 × π × r² = π × d²
- Area of a trapezoid: If a and b are the two parallel sides and h is the distance (height) between the parallels, the area formula is as below: :

A=\frac(a+b)h

A=\frac

- Total surface area of a right circular cylinder: 2 × π × r × (h + r)
- Lateral surface area of a right circular cylinder: 2 × π × r × h
- Total surface area of a right circular cone: π × r × (l + r)
- Lateral surface area of a right circular cone: π × r × l

External links

- [http://www.unitconversion.org/unit_converter/area.html Online Area Converter - convert between various units of area, such as square meter, hectare, rood, and so on]
- [http://www.unitconversion.org/unit_converter/area-v.html Interactive Area Conversion table - convert selected unit to all other units of area]
- [http://calc.skyrocket.de/en/ Online Unit Converter - Conversion of many different units]
- als:Fläche ja:面積 ko:면적 simple:Area th:พื้นที่ zh-min-nan:Bīn-chek

Square metre

A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. It is the SI unit of area. It is abbreviated m². A square metre is equal to:
- 0.000 001 square kilometre (km²)
- 10 000 square centimetres (cm²)
- 0.000 1 hectares
- 0.01 ares
- 0.000 247 105 381 acres
- 1.195 990 square yards
- 10.763 911 square feet
- 1,550.003 1 square inches

Square kilometre

1 km² is equal to:
- the area of a square measuring 1 kilometre on each side
- 1,000,000 m²
- 100 hectares
- 0.386 102 square miles (statute)
- 247.105 381 acres Conversely:
- 1 m² = 0.000 001 km²
- 1 hectare = 0.01 km²
- 1 square mile = 2.589 988 km²
- 1 acre = 0.004 047 km² Note: "km²" means square kilometre and not kilo–square metre. For example, 3 km² is equal to 3 000 000 m² and not to 3 000 m².

Square megametre

Square megametres are not widely used; however, there are a number of "megametre fans" who think that this unit is very convenient for measuring oceans and continents. 1 Mm² is equal to:
- the area of a square measuring 1 megametre on each side
- 1,000,000,000,000 m²
- 100,000,000 hectares
- 1,000,000 km²

Cubic metre

The cubic metre (symbol m³) is the SI derived unit of volume. It is the volume of a cube with edges one metre in length.

History

Older equivalents were the stere and the kilolitre. The deprecation of the stere began in 1978, when the CIPM marked it (and several other metric units) as "undesirable" where not already in use, and strongly encouraged their discontinuation; in the United States, it was legally deprecated in 1982 (Federal Register, February 26, 1982, 47 FR 8399-8400) [http://physics.nist.gov/cuu/Units/register.html] [http://www.sizes.com/units/stegravere.htm].

Conversions

1 cubic metre is equivalent to:
- 1,000 litres (exactly)
- ~35.3 cubic feet (approximately). 1 cubic foot is 0.028 316 846 592 m³ (exactly)
- ~1.31 cubic yards (approximately). 1 cubic yard is 0.764 554 857 984 m³ (exactly)
- ~6.29 oil barrels (approximately). 1 barrel is 0.158 987 294 928 m³ (exactly) A cubic metre of pure water at a temperature of 3.98 °C (degrees Celsius) and standard atmospheric pressure has a mass of 999.972 kg (nearly one tonne). It is sometimes abbreviated m3 or m^3 when superscript characters are not available/accessible (i.e. in some typewritten documents and postings in Usenet newsgroups).

Multiples and submultiples

- A cubic decimetre (symbol dm³) is the volume of a cube of side length 1 decimetre (0.1 metre).
- 1 cubic decimetre is now equal to 1 litre. See 1 E-3 m³ for a comparison with other volumes.
- From 1901 to 1964 of the litre was defined as the volume of 1 kilogram of pure water at 4 degrees Celsius and 760 millimetres of mercury pressure. During this time, a litre was about 1.000028 dm³. In 1964 the original definition was reverted to.
- A cubic centimetre (cm³) is equal to the volume of a cube with side length of 1 centimetre. It was the base unit of volume of the CGS system of units, and is a legitimate SI unit.
- The colloquial abbreviations cc and ccm are not SI but are common in some contexts in English. For example 'cc' is commonly used for denoting displacement of car and motorbike engines "the Mini Cooper had a 1275 cc engine". In American medicine 'cc' is also common, for example "100 cc of blood loss".
- A cubic millimetre (mm³) is the volume equal to that of a cube with edges of 1 millimetre.
- A cubic kilometre (km³) is the volume equal to that of a cube of side length 1 kilometre.

External link

- [http://www.ex.ac.uk/trol/scol/index.htm Conversion Calculator for Units of VOLUME] Category:Orders of magnitude (volume) Category:Units of volume Category:SI derived units ko:세제곱미터 ja:立方メートル th:ลูกบาศก์เมตร

CJK

: CJK can also stand for Centre Jeunes Kamenge. CJK is a collective term for Chinese, Japanese, and Korean, which comprise the main East Asian languages. The term is used in the field of software and communications internationalization. The term CJKV is used to mean CJK plus Vietnamese, which used Chinese characters prior to adopting a written language solely on Romanization. These languages all have a shared characteristic: Their writing systems are partly or entirely based on Chinese characters—Hanzi in Chinese, Kanji in Japanese, Hanja in Korean, and Chữ nôm in Vietnamese. Chinese requires at least 4,000 characters for a basic vocabulary and up to 40,000 characters for reasonably complete coverage. Whereas Japanese and Korean use fewer characters—general literacy in Japan can be expected with about 2,000 characters—idiosyncratic use of Chinese characters in proper names requires knowledge (and therefore availability) of many more. The number of characters required for complete coverage of all these languages' needs cannot fit in the 256-character code space of 8-bit encodings, requiring at least a 16-bit fixed width character encoding or multi-byte variable-length encodings. The 16-bit fixed width encodings, such as Unicode up to and including version 2.0, are now deprecated due to the requirement that software in China support the GB18030 character set. Although CJK encodings have common character sets, the encodings often used to represent them have been developed separately by different East Asian governments and software companies, and are mutually incompatible. Unicode has attempted, with some controversy, to unify the character sets in a process known as Han unification. CJK character encodings should consist minimally of Han characters plus language-specific phonetic scripts such as pinyin, bopomofo, hiragana, katakana, and Hangul. CJK character encodings include:
- Big5
- EUC-JP
- EUC-KR
- GB18030 (the mandated standard in the People's Republic of China)
- GB2312
- ISO 2022-JP
- Shift-JIS
- Unicode The CJK character sets take up the bulk of the Unicode code space. There is much controversy among Japanese experts of Chinese characters about the desirability and technical merit of the Han unification process used to map multiple Chinese and Japanese characters sets into a single set of unified glyphs.

References

- DeFrancis, John. The Chinese Language: Fact and Fantasy. Honolulu: University of Hawaii Press, 1990. ISBN 0824810686.
- Hannas, William C. Asia's Orthographic Dilemma. Honolulu: University of Hawaii Press, 1997. ISBN 082481892X (paperback); ISBN 0824818423 (hardcover).
- Lunde, Ken. CJKV Information Processing. Sebastopol, Calif.: O'Reilly & Associates, 1998. ISBN 1565922247.

External links

- http://www.praxagora.com/lunde/cjk_inf.html Category:Korean language Category:Encodings of Japanese Category:Character encoding

Chinese character

] Chinese characters or Han characters () are logograms used in the written forms of the Chinese language, and to varying degrees in the Japanese and Korean. Use of Chinese characters has disappeared from the Vietnamese language — in which they were used until the 20th century — and from Korea, where in normal writing they have been completely replaced by Hangul. Contrary to popular belief, only a small number of Chinese characters are pictograms. Most characters are based on other characters that were homonyms when the character was created. Chinese characters are called hànzì in Mandarin Chinese, kanji in Japanese, hanja or hanmun in Korean, and hán tự or chữ nho in Vietnamese. In modern written Chinese, characters are written either in Traditional Chinese characters (used in Taiwan, Hong Kong, and Macau) or Simplified Chinese characters (used in Mainland China, Malaysia and Singapore) In Chinese, a word or phrase (词 / 詞 cí) (a unit of meaning) is composed of one or more characters (字 zì), for instance the phrase 汉字 / 漢字 hànzì is composed by two characters. Each Chinese character represents a single syllabic unit in all spoken variants of Chinese still existing today. However, unlike modern Chinese dialects, Archaic Chinese had consonant clusters and lacked a tonal feature, for example 角 jiǎo is pronounced klak in Archaic Chinese. Japanese, Korean, and Vietnamese are not linguistically related to Chinese, and in order to make Chinese characters work in those languages with radically different grammar, many adaptations had to be made. For example, Japanese kanji are used to represent not only borrowings from Chinese, which are monosyllabic, but also native words (Kun'yomi), which are often multisyllabic. In many cases in these languages, there are differences from characters used in Chinese. Japanese has standardised on a set of 1,945 characters, known as the Jōyō kanji, which includes simplified or variant forms of characters traditionally used in China, as well as a number of Chinese characters created by the Japanese themselves. In China itself, thousands of simplified characters were created and adopted in Mainland China between 1956 and 1964 to eradicate mass illiteracies. This created major distinctions between the two sets of characters. (For example, 汉 in simplified characters used in Mainland China and Singapore, and 漢 in traditional characters used in Taiwan, Hong Kong, and Macau.) Just as Roman letters have a characteristic shape (lower-case letters occupying a roundish area, with ascenders or descenders on some letters), Chinese characters tend to occupy a more-or-less square area. Characters made up of multiple parts squash these parts together in order to maintain a uniform size and shape. Because of this, beginners often practise on squared or graph paper, and the Chinese sometimes call Han characters "square characters". Roman letter

Origin

The oldest Chinese inscriptions that are clearly writing are the poorly understood Oracle Script (甲骨文 jiǎgǔwén) of the late Shang Dynasty (or Yin (殷) Dynasty), attested from about 1200 BC. Only about 1400 of the 2500 known Oracle Script glyphs can be identified with later Chinese characters and can therefore be easily read. There have been suggestions that this was not designed for the Chinese language, or even for a Sino-Tibetan language, because it does not seem to reflect Chinese morphology accurately. An analogy would be if English were written with a script that had a single character for die and kill, but two separate characters for warm in "it's a warm day" and "please warm the bath". Although the succeeding Zhou Dynasty was clearly Han Chinese, it's not clear which ethnic group the Shang were. One possibility is Miao (苗 Miáo). The first recorded Miao kingdom was Jiuli. The ancestors of the Jiuli are thought to be the Liangzhu people, and it is these who are credited with creating the Oracle Script. According to Chinese legend, Jiuli was defeated by the military unification of Huang Di (黃帝 Huángdì) and Yandi, leaders of the Huaxia (華夏 Huáxià) tribe (the ancestors of the Han Chinese) as they struggled for supremacy of the Huang He valley. After their defeat, the Jiuli people who were not absorbed into the new Zhou state moved south, splitting into the Miao and the Li (黎 Lí) peoples. The Yi script is quite old and is superficially similar to Chinese, but does not seem to be derived from it. It was perhaps inspired by the example of Chinese, but the possibility cannot be discounted that it and the Chinese script both descend from a common source such as the Oracle Script.

Styles

Yi script]] The earliest Chinese characters are the so called Oracle Script of the late Shang Dynasty, followed by the Bronzeware Script or (金文) jīnwén during the Zhou Dynasty. These scripts no longer serve as anything but a source for scholars. The first script that is still in (restricted) use today is the "Seal Script" or 篆書[篆书] zhuànshū. It is the result of the efforts of the first emperor of China, Qin Shi Huang, in the standardization of the Chinese script. The Seal Script, as the name suggests, is now only used in artistic seals. Few people are still able to read the seal script, although the art of carving a traditional seal in the seal script remains alive in China today. Scripts that are still used regularly for print are the "Clerk Script" or 隸書[隶书] lìshū, the "Wei Monumental" or 魏碑 wèibēi, the "Regular Script" or 楷書[楷书] kǎishū, the "Song Style" or 宋體[宋体] sòngtǐ (mainly used in printing and computer fonts), and the "Running Script" or 行書[行书] xíngshū. Modern Chinese handwriting is usually modeled on the Running Script. Finally, there is the "Draft Script" (also called "Grass Script"), or 草書[草书] cǎoshū. The draft script is an idealized calligraphic style, where characters are suggested rather than realized. Despite being cursive to the point where individual strokes are no longer differentiable, the draft script is highly revered for the beauty and freedom that it embodies. Many simplified Chinese characters are based on this style.

Radicals

Draft Script]] Main article: radical Each character has a fundamental component, or radical (部首 bù shǒu, literally "initial portion"), and this design principle is used in Chinese dictionaries to logically order characters in sets. Full characters are ordered according to their initial radical, which fall into roughly 200 types. Then these are subcategorised by their total number of strokes.

Classification

See also: Chinese character classification Chinese scholars have traditionally classified Han characters into six types by etymology (六书). The first two types are single-body (独体), which means that the character was created independent of other Chinese characters preceding it. The first type, and the type most often associated with Chinese writing, are pictograms(象形字), which are pictorial representations of the morpheme represented. The second type are

Kilometre

Metric system

Pronunciation

See also

American English

History

Phonology

Differences in British English and American English

English words that arose in the U.S.

English words obsolete outside the U.S.

Regional differences

See also

Further reading

References

External links

Length

Units of length(SI)

Other units of length

The Imperial and US customary units of length

Units are used in astronomy

See also

External links

Metre

Conversions

History

Timeline of definition

See also

External links

Greek language

History

Classification

Geographic distribution

Official status

Phonology

Vowel sounds

Mile

See also

Reference

External links

Foot (unit of length)

Etymology

See also

External link

Klick

External links

Kilometre per hour

Conversions

See also

External links

Metre

Conversions

History

Timeline of definition

See also

External links

Hectometre

Conversions

History

Timeline of definition

See also

External links

Length

Units of length(SI)

Other units of length

The Imperial and US customary units of length

Units are used in astronomy

See also

External links

Area

Units

Useful formulas

External links

Square metre

Square kilometre

Square megametre

See also

Cubic metre

History

Conversions

Multiples and submultiples