air pressure

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


Origin:
1870–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To air pressure
Example sentences
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.
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