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air pressure

the force exerted by air, whether compressed or unconfined, on any surface in contact with it.
Origin of air pressure
1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for air-pressure
Historical Examples
  • He had closed the outer panel; the air-pressure in the lock was rising.

  • 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
  • Their only purpose was to get the piston lifted, and air-pressure did all the actual work.

    Steam Steel and Electricity James W. Steele
  • This not only guided the flight of the machine, but counterbalanced the changes of the centre of air-pressure.

    Historic Inventions Rupert S. Holland
  • The carburetor flushes his blood with oxygen, the decompression tank adjusts him to the lack of air-pressure.

    Sjambak John Holbrook Vance
  • If the air-pressure within the ship were released; if even a crack were opened!

    Brood of the Dark Moon Charles Willard Diffin
  • Then the fire was removed and, as the cylinder cooled, the steam condensed, and the piston was forced down by air-pressure.

    The Story of Great Inventions Elmer Ellsworth Burns
  • The air-pressure forces piston 12 downwards and closes steam-valve 14, thus cutting off the supply of steam to the pump.

    How it Works Archibald Williams
  • This is because the air-pressure is less on the mountain top than in the valley.

    The Story of Great Inventions Elmer Ellsworth Burns
  • Its function is probably to keep the air-pressure equal on both sides of the drum.

    How it Works Archibald Williams

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