| atm | Symbol for standard atmosphere. (05 Mar 2000) |
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| atmo | 1. <prefix> Prefix denoting steam or vapor; or derived by action of steam or vapor. 2. <physics> The standard atmospheric pressure used in certain physical measurements calculations; conventionally, that pressure under which the barometer stands at 760 millimetres, at a temperature of 0 deg Centigrade, at the level of the sea, and in the latitude of Paris. Origin: Contr. Fr. Atmosphere, G. Atmos, steam, vapor Source: Websters Dictionary (20 Jun 2000) |
| atmological | Of or pertaining to atmology. Source: Websters Dictionary (01 Mar 1998) |
| atmologist | <specialist> One who is versed in atmology. Source: Websters Dictionary (01 Mar 1998) |
| atmology | <physics, study> That branch of science which treats of the laws and phenomena of aqueous vapor. Origin: Gr. Vapor. (04 Mar 1998) |
| atmolysis | <chemistry> The act or process of separating mingled gases of unequal diffusibility by transmission through porous substances. Origin: Gr. Vapor + a loosing, to loose. Source: Websters Dictionary (01 Mar 1998) |
| atmolyzation | <chemistry> Separation by atmolysis. Source: Websters Dictionary (01 Mar 1998) |
| atmolyze | <chemistry> To subject to atmolysis; to separate by atmolysis. Source: Websters Dictionary (01 Mar 1998) |
| atmolyzer | <chemistry> An apparatus for effecting atmolysis. Source: Websters Dictionary (01 Mar 1998) |
| atmometer | <instrument> An instrument for measuring the rate of evaporation. Origin: atmo-+ G. Metron, measure (05 Mar 2000) |
| atmos | An obsolete abbreviation A unit of pressure; replaced by atm. Origin: abbreviation of atmosphere (05 Mar 2000) |
| atmosphere | 1. <ecology> The mixture of gases surrounding the Earth and other planets. 2. <physics> A unit of pressure which equals 101.325 kPa. (09 Oct 1997) |
| atmosphere absolute | <physics> A unit of absolute pressure (also known as barometric pressure) expressed in atm. (05 Mar 2000) |
| atmospheric | 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. "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. <engineering> Atmospheric line, 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 Tide. Origin: Cf. F. Atmospherique. Source: Websters Dictionary (01 Mar 1998) |
| atmospheric pressure | The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned. (12 Dec 1998) |