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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



... he sat in the pit, reasoned with himself as to what might be the cause of his fall, and came to the conclusion that it was an earthquake; also, that his sudden flight into the pit might create an atmospheric pressure, from the earth and the pit, which would wipe out the seven planets. The father rushed up with a rope. "Here's a rope for you," says he, "catch hold of it. I'll drag you out; look out that you don't fall off!" "No, wait; don't pull me out yet; tell me first, what sort of a thing is a rope?" "Although ...
— A Survey of Russian Literature, with Selections • Isabel Florence Hapgood
... Nature abhors a vacuum, Anthony. I would not dare go about with an empty heart: why, the first girl I met would fly into it by mere atmospheric pressure. Alice keeps them out now. Mrs ...
— Getting Married • George Bernard Shaw
... out of the window and gave a wild cry. 'Red sky in the morning shepherds' warning,' she wailed. At breakfast Cocklewhite phoned that his leech was dead, and he had strong suspicions it had died from atmospheric pressure. Almost at the same moment Lysander sent word that his seaweed had gone clammy during the night. Half-an-hour later came a clap of thunder and the drops of rain I mentioned. I needn't go on. ...
— Punch, or the London Charivari, Vol. 159, July 14th, 1920 • Various
... CORD. Caisson Disease; Divers' Paralysis. Causes.—This affection occurs in divers, bridge builders, and others who are subject to increased atmospheric pressure. The symptoms develop on coming suddenly to the surface when the atmospheric pressure ...
— Mother's Remedies - Over One Thousand Tried and Tested Remedies from Mothers - of the United States and Canada • T. J. Ritter
... intimates. The Parisian omnibuses, as I remember them half a century ago,—they may still keep to the same habit, for aught that I know,—used to put up the sign "Complet" as soon as they were full. Our public conveyances are never full until the natural atmospheric pressure of sixteen pounds to the square inch is doubled, in the close packing of the human sardines that fill the all-accommodating vehicles. A new-comer, however well mannered and well dressed, is not very welcome under these circumstances. In the same way, our tables ...
— The Autocrat of the Breakfast-Table • Oliver Wendell Holmes, Sr. (The Physician and Poet not the Jurist)


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