- the force exerted by air, whether compressed or unconfined, on any surface in contact with it.
Compare atmospheric pressure.
Origin of air pressure
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for air pressure
An air-pressure is then produced in the tank with a bicycle pump.Boys' Book of Model Boats
Raymond Francis Yates
He had closed the outer panel; the air-pressure in the lock was rising.
Their only purpose was to get the piston lifted, and air-pressure did all the actual work.Steam Steel and Electricity
James W. Steele
He entered the air-lock and shut the first door when the air-pressure was right.The Victor
This is because the air-pressure is less on the mountain top than in the valley.The Story of Great Inventions
Elmer Ellsworth Burns