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De - Pt| English Dictionary: atmospheric pressure | by the DICT Development Group |
| 3 results for atmospheric pressure | |
| From WordNet (r) 3.0 (2006) [wn]: | |
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| From Webster's Revised Unabridged Dictionary (1913) [web1913]: | |
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Pressure \Pres"sure\ (?; 138), n. [OF., fr. L. pressura, fr. premere. See 4th {Press}.] 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. --Macaulay. 3. Affliction; distress; grievance. My people's pressures are grievous. --Eikon Basilike. In the midst of his great troubles and pressures. --Atterbury. 4. Urgency; as, the pressure of business. 5. Impression; stamp; character impressed. All saws of books, all forms, all pressures past. --Shak. 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 upon a unit's area. {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. --Rankine. {Pressure gauge}, a gauge for indicating fluid pressure; a manometer. | |
| From Webster's Revised Unabridged Dictionary (1913) [web1913]: | |
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Atmospheric \At`mos*pher"ic\, Atmospherical \At`mos*pher"ic*al\, a. [Cf. F. atmosph[82]rique.] 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 in the atmosphere. The lower atmospheric current. --Darwin. 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. --Pope. {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. --Tomlinson. {Atmospheric line} (Steam Engin.), the equilibrium line of an indicator card. Steam is expanded [bd]down to the atmosphere[b8] 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}. | |
