air pressure

noun

the force exerted by air, whether compressed or unconfined, on any surface in contact with it.

Origin

1870-75

Examples from the web for air pressure

Many of their students lack a fundamental understanding of how air pressure works.
The turbine turns because the air pressure on one side of the blade is higher than the other side.
Warm, moist air over tropical or subtropical seas rises, causing a zone of lower air pressure beneath it.
It can be redesigned for high performance by simply increasing the air pressure and the outlet valve size.
There was also concern about differences in air pressure zones causing it to flip or veer suddenly.
Stars twinkle due to random variations in air pressure.
Blowing into the bottle raises the air pressure again.
Any slight change in wind speed or air pressure can result in a failure to launch.
Elicit from students that the instrument measures air pressure.
Because of the low air pressure, the body overcompensates and speeds up its blood circulation.