air: see atmosphere atmosphere [Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the atmospheres of other planets and satellites are known, only the earth's atmosphere has been well studied, the
..... Click the link for more information. ; liquid air liquid air, ordinary air that has been liquefied by compression and cooling to extremely low temperatures (see liquefaction ). Its commercial preparation involves purification by washing to remove soluble impurities and by passage over calcium oxide (lime) to remove
..... Click the link for more information. ; ventilation ventilation, process of supplying fresh air to an enclosed space and removing from it air contaminated by odors, gases, or smoke.

Proper ventilation requires also that there be a movement or circulation of the air within the space and that the temperature and
..... Click the link for more information. .

air

Mixture of gases constituting the earth's atmosphere. Some gases occur in steady concentrations. The most important are molecular nitrogen (N₂), 78% by volume, and molecular oxygen (O₂), 21%. Small amounts of argon (Ar; 1.9%), neon (Ne), helium (He), methane (CH₄), krypton (Kr), hydrogen (H₂), nitrous oxide (N₂O), and xenon (Xe) are also present in almost constant proportions. Other gases occur in variable concentrations: water vapour (H₂O), ozone (O₃), carbon dioxide (CO₂), sulfur dioxide (SO₂), and nitrogen dioxide (NO₂). Air also contains trace amounts of ammonia and hydrogen sulfide. The variable constituents are important for maintaining life. Water vapour is the source for all forms of precipitation and is an important absorber and emitter of infrared radiation. Carbon dioxide is necessary for photosynthesis and is also an important absorber and emitter of infrared radiation. Ozone in the stratosphere (see ozone layer) is an effective absorber of ultraviolet radiation from the Sun but at ground-level is a corrosive pollutant and a major constituent of smog.

Air

Alarm (See WARNING.)

Aeolus

god of the winds. [Gk. Myth.: Zimmerman, 9]

Aether

god of whole atmosphere. [Gk. Myth.: Jobes, 42]

Aurae

winged nymphs of breezes. [Rom. Myth.: LLEI, I: 323]

Juno

in allegories of elements, personification of air. [Art: Hall, 128]

sylph

spirit inhabiting atmosphere in Rosicrucian philosophy. [Medieval Hist.: Brewer Dictionary, 1055]

(standard)

AIR - A future infrared standard from IrDA. AIR will provide in-room multipoint to multipoint connectivity. AIR supports a data rate of 4 Mbps at a distance of 4 metres, and 250 Kbps at up to 8 metres. It is designed for cordless connections to multiple peripherals and meeting room collaboration applications.

See also IrDA Data and IrDA Control

Air (redirected from walk on air)

air

Air
(redirected from walk on air)