1. A mixture of odorless gases found in the atmosphere in the following approximate percentages by volume after water vapor has been removed: oxygen, 20.95; nitrogen, 78.08; argon 0.93; carbon dioxide, 0.03; other gases, 0.01. Formerly used to mean any respiratory gas, regardless of its composition.
2. Syn: ventilate.
Origin
alveolar air
complemental air
complementary air
functional residual air
air hunger
liquid air
minimal air
reserve air
residual air
supplemental air
tidal air
vitiated air