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| Diffuser |
DiffuserDiffusser or diffuser can mean:-
- Diffuser (breathing set part)
- Diffuser (music band)
- Diffuser (thermodynamics)
Diffuser (breathing set part)A diffuser is a device fitted over an underwater breathing set's blowoff hole to break up the resulting bubbles very small so they will not be seen from out of the water. They are mostly needed in frogman-type diving operations where secrecy is needed, and in marine biology to avoid scaring fish which are being studied. Designing an adequate diffuser on a rebreather is much easier than on open-circuit scuba.
Category:Diving
Diffuser (music band)Diffuser is a pop punk band from the Long Island area that formed in 1994. As of 2005, they have released two albums, Injury Loves Melody (2001) and Making the Grade (2003), both with Hollywood Records. Their single Karma was included on the soundtrack for Mission: Impossible 2, and peaked at number 20 on the Billboard Mainstream Rock Tracks chart.
The band's members were formerly known as "Flu Thirteen", under which name they released the album In the Foul Key of V in 1998.
Category:American musical groups
Classical element/Air
Air is a name for the mixture of gases present in the Earth's atmosphere.
Compressed air is often used in scuba diving as a shallow water breathing gas and to inflate buoyancy devices. Compressed air is also used as the means of transmission of energy to pneumatic tools.
Composition of air
By volume, air is about:
- 78.084% Nitrogen (N2)
- 20.947% Oxygen (O2)
- 0.934% Argon (Ar)
- 0.033% Carbon Dioxide (CO2)
With trace amounts of:
- Neon (Ne)
- Helium (He)
- Krypton (Kr)
- Sulfur dioxide (SO2)
- Methane (CH4)
- Hydrogen (H2)
- Nitrous Oxide (N2O)
- Xenon (Xe)
- Ozone (O3)
- Nitrogen dioxide (NO2)
- Iodine (I2)
- Carbon monoxide (CO)
- Ammonia (NH3)
The amount of water vapor in the air varies considerably depending on weather, climate, and altitude. See Humidity.
The molecular mass of air is approximately 28.96443 g/mole (molecular weight of standard air - CRC, 1983).
See also
- Air glow
- Density of air
- Air (band)
External link
- [http://mistupid.com/chemistry/aircomp.htm Composition of Air]
Category:Atmosphere
Category:Psychrometrics
Category:HVAC
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Cacique (bird)
Many, see text
The caciques, are passerine birds in the New World blackbird family. Members of the family are resident breeders in tropical South America and north to Mexico. All bar one of the group are in the genus Cacicus.
The caciques are birds associated with open woodland or denser forests. They are colonial breed
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H. Wayne Light, Ph.D.
H. Wayne Light, Ph.D., is the author of Light's Retention Scale, a counseling tool that is designed to assist parents and school staff in determining if a child should be retained in grade (failed, etc.). This scale was originally written during 1977 and has been revised on four occasions with the latest revision due during 2006. The Light's Retention Scale has been sold in over 15 countries and the publisher, Academic Therapy Publications, states that they have sold more than one million copies with more than 90 percent of all North American Schools using this tool.
Dr. Light has also writte
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