Air is a general term which can mean, among others:
1. The mixture of gases that make up the atmosphere ; 78% nitrogen and 21% oxygen with the balance consisting of smaller amounts of gases including argon, carbon dioxide, neon, helium, and other gases required for breathing;
AIR HANDLING UNIT (AHU): For purposes of this document refers to equipment that includes a blower or fan, heating and/or cooling coils, and related equipment such as controls, condensate drain pans, and air filters. Does not include ductwork, registers or grilles, or boilers and chillers.
AIR PASSAGES: Openings through or within walls, through floors and ceilings, and around chimney flues and plumbing chases, that permit air to move out of the conditioned spaces of the building.
Air waves - a sound wave that travels through the air at approximately 330 m/s and can be generated and recorded during seismic surveying. Air waves are a type of coherent noise.
Indoor air pollutants - Particles and dust, fibers, mists, bioaerosols, and gases or vapors.
Airbeds are now designed to look like the familiar mattress/boxspring combination, with an air-filled core providing the support instead of an innerspring unit or foam core. These designs also offer a range of feels and typically are adjustable to suit individual sleeper's needs.
Other Database Pages Exist for this Phrase:
Carbon dioxide (A Carbon Dioxide is Burning fossil fuels releases ...)
List of books: Air