n. [ Contr. fr. atmosphere. ] (Physics) The standard atmospheric pressure used in certain physical measurements calculations; conventionally, that pressure under which the barometer stands at 760 millimeters, at a temperature of 0° Centigrade, at the level of the sea, and in the latitude of Paris. Sir W. Thomson. [ 1913 Webster ]

{ } a. Of or pertaining to atmology. “Atmological laws of heat.” Whewell. [ 1913 Webster ]

n. One who is versed in atmology. [ 1913 Webster ]

n. [ Gr. &unr_; vapor + -logy. ] (Physics) That branch of science which treats of the laws and phenomena of aqueous vapor. Whewell. [ 1913 Webster ]

n. [ Gr. &unr_; vapor + &unr_; a loosing, &unr_; to loose. ] (Chem.) The act or process of separating mingled gases of unequal diffusibility by transmission through porous substances. See also gaseous diffusion. [ 1913 Webster ]

n. (Chem.) Separation by atmolysis. [ 1913 Webster ]

v. t. (Chem.) To subject to atmolysis; to separate by atmolysis. [ 1913 Webster ]

n. (Chem.) An apparatus for effecting atmolysis. [ 1913 Webster ]

n. [ Gr. &unr_; smoke, vapor + -meter: cf. F. atmomètre. ] An instrument for measuring the rate of evaporation from a moist surface; an evaporometer. Huxley. [ 1913 Webster ]

n. [ Gr. &unr_; vapor (akin to Skr. ātman breath, soul, G. athem breath) + &unr_; sphere: cf. F. atmosphère. See Sphere. ] 1. (Physics) (a) The whole mass of aëriform fluid surrounding the earth; -- applied also to the gaseous envelope of any celestial orb, or other body; as, the atmosphere of Mars. (b) Any gaseous envelope or medium. [ 1913 Webster ]

An atmosphere of cold oxygen. Miller. [ 1913 Webster ]

2. A supposed medium around various bodies; as, electrical atmosphere, a medium formerly supposed to surround electrical bodies. Franklin. [ 1913 Webster ]

3. The pressure or weight of the air at the sea level, on a unit of surface, or about 14.7 lbs. to the sq. inch. [ 1913 Webster ]

Hydrogen was liquefied under a pressure of 650 atmospheres. Lubbock. [ 1913 Webster ]

4. Any surrounding or pervading influence or condition. [ 1913 Webster ]

The chillest of social atmospheres. Hawthorne. [ 1913 Webster ]

5. The portion of air in any locality, or affected by a special physical or sanitary condition; as, the atmosphere of the room; a moist or noxious atmosphere. [ 1913 Webster ]

{ } a. [ Cf. F. atmosphérique. ] 1. Of or pertaining to the atmosphere; of the nature of, or resembling, the atmosphere; as, atmospheric air; the atmospheric envelope of the earth. [ 1913 Webster ]

2. Existing or occurring in the atmosphere. [ 1913 Webster ]

The lower atmospheric current. Darwin. [ 1913 Webster ]

3. Caused, or operated on, by the atmosphere; as, an atmospheric effect; an atmospheric engine. [ 1913 Webster ]

4. Dependent on the atmosphere. [ R. ] [ 1913 Webster ]

In am so atmospherical a creature. Pope. [ 1913 Webster ]

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 “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. [ 1913 Webster ]

adv. In relation to the atmosphere. [ 1913 Webster ]

n. [ Atmosphere + -logy. ] The science or a treatise on the atmosphere. [ 1913 Webster ]