Origin of air pressure
Examples from the Web for air pressure
Its function is probably to keep the air-pressure equal on both sides of the drum.How it Works|Archibald Williams
We are now getting the air-pressure through the pipe in both ends of the tube alike, and do not move the pellet either way.Steam Steel and Electricity|James W. Steele
Railway air-brake, use of air-pressure in applying brakes to the wheels of a car.
A thin place or a hot place will give way under the air-pressure and be sucked into the tube.Laboratory Manual of Glass-Blowing|Francis C. Frary
By using an air-pump to remove the air-pressure, water may be made to boil when it is still quite cold to the hand.