atmosphere (esp. of a place or person); mood; vibe; ambience
air chair; wall sit; exercise mimicking sitting in a chair; chain of people sitting on each other's laps
treating (someone) like they are air; ignoring (someone)
air sac; bladder; air bag; windbag; type of inflatable air mattress
respirator; breathing apparatus
atmospheric oxidation; oxidation upon exposure to the air; air oxidation; smoothering
pneumatic drill; air drill
mixture of air and hydrocarbon gas or vapour
air suspension; air spring