the flow of air; "she adjusted the fan so that the airflow was directed right at her"
air will flow from an area of higher pressure to one of lower pressure; during inspiration, the pressure in the alveoli (lung tissue) must be less than the pressure at the mouth for air to flow in, and during expiration, the reverse is true.
as in volume air flow rate needed to transfer heat
The quantity of air that can flow through a two foot by two foot by one foot foam sample with a five inch water pressure differential. Air flow is expressed in cubic feet per minute.
A measure of the ease with which air will pass through a foam sample. (Test Method ASTM D3574)
Amount of air expressed in cubic feet per minute, that can be drawn through a 2"x 2"x 1" foam sample at .5-inch water pressure differential. Air Flow is measured by a test (ASTM D3574).