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Atmospheric pressure   /ˌætməsfˈɛrɪk prˈɛʃər/   Listen
noun
Pressure  n.  
1.
The act of pressing, or the condition of being pressed; compression; a squeezing; a crushing; as, a pressure of the hand.
2.
A contrasting force or impulse of any kind; as, the pressure of poverty; the pressure of taxes; the pressure of motives on the mind; the pressure of civilization. "Where the pressure of danger was not felt."
3.
Affliction; distress; grievance. "My people's pressures are grievous." "In the midst of his great troubles and pressures."
4.
Urgency; as, the pressure of business.
5.
Impression; stamp; character impressed. "All saws of books, all forms, all pressures past."
6.
(Mech.) The action of a force against some obstacle or opposing force; a force in the nature of a thrust, distributed over a surface, often estimated with reference to the amount upon a unit's area.
7.
Electro-motive force.
Atmospheric pressure, Center of pressure, etc. See under Atmospheric, Center, etc.
Back pressure (Steam engine), pressure which resists the motion of the piston, as the pressure of exhaust steam which does not find free outlet.
Fluid pressure, pressure like that exerted by a fluid. It is a thrust which is normal and equally intense in all directions around a point.
Pressure gauge, a gauge for indicating fluid pressure; a manometer.


adjective
Atmospherical, Atmospheric  adj.  
1.
Of or pertaining to the atmosphere; of the nature of, or resembling, the atmosphere; as, atmospheric air; the atmospheric envelope of the earth.
2.
Existing or occurring in the atmosphere. "The lower atmospheric current."
3.
Caused, or operated on, by the atmosphere; as, an atmospheric effect; an atmospheric engine.
4.
Dependent on the atmosphere. (R.) "In am so atmospherical a creature."
Atmospheric engine, a steam engine whose piston descends by the pressure of the atmosphere, when the steam which raised it is condensed within the cylinder.
Atmospheric line (Steam Engin.), the equilibrium line of an indicator card. Steam is expanded "down to the atmosphere" when its pressure is equal to that of the atmosphere. (See Indicator card.)
Atmospheric pressure, the pressure exerted by the atmosphere, not merely downwards, but in every direction. In amounts to about 14.7 Ibs. on each square inch.
Atmospheric railway, one in which pneumatic power, obtained from compressed air or the creation of a vacuum, is the propelling force.
Atmospheric tides. See under Tide.





Collaborative International Dictionary of English 0.48


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"Atmospheric pressure" Quotes from Famous Books



... one change lay all the difference between the Newcomen engine, limited to atmospheric pressure, and the steam engine, capable of development into the modern engine through the increasing use of the tremendous force of steam under higher pressures, and improved conditions from time ...
— James Watt • Andrew Carnegie
... formed before the next stage could be reached, at which it would be possible for water to exist in a fluid state. This, however, would be possible at a much higher temperature than at present, owing to the enormous atmospheric pressure. It is possible now, by artificial means, to raise water, nearly if not quite, to a red heat, without the formation of steam, and the pressure of the atmosphere in the case supposed would, in all probability, be much greater than any which we can now apply under the conditions ...
— The Story of Creation as told by Theology and by Science • T. S. Ackland
... sheep—currents created like winds by a variation of temperature in different parts of any given field, and which will scatter the scent and spoil the sport. These currents, rapid evaporation combined with a lack of steady atmospheric pressure, and that sticky state of soil which on ploughed land invariably follows a frost, and in a lesser degree affects grass, causing a fox to take his pad scent on with him (all the particles that do not cling ...
— A Cotswold Village • J. Arthur Gibbs
... astride the rubbery inflated covering, clawing and tearing. The thing collapsed and went flat between his knees. He saw the mist of moisture-laden escaping air; felt the quick swelling and the jarring collapse as internal organs exploded from the atmospheric pressure inside the brute's body. Nauseated, he crawled away ...
— The Copper-Clad World • Harl Vincent


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