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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 0º Centigrade, at the level of the sea, and in the latitude of Paris. Sir W. Thomson.

Of or pertaining to atmology. "Atmological laws of heat." Whewell.

One who is versed in atmology.

That branch of science which treats of the laws and phenomena of aqueous vapor. Whewell.

The act or process of separating mingled gases of unequal diffusibility by transmission through porous substances.

Separation by atmolysis.

To subject to atmolysis; to separate by atmolysis.

An apparatus for effecting atmolysis.

An instrument for measuring the rate of evaporation from a moist surface; an evaporometer. Huxley.

rth; -- applied also to the gaseous envelope of any celestial orb, or other body; as, the atmosphere of Mars.

Of or pertaining to the atmosphere; of the nature of, or resembling, the atmosphere; as, atmospheric air; the atmospheric envelope of the earth.

In relation to the atmosphere.

The science or a treatise on the atmosphere.

Of or pertaining to the air, or atmosphere; inhabiting or frequenting the air; produced by or found in the air; performed in the air; as, aërial regions or currents. "Aërial spirits." Milton. "Aërial voyages." Darwin.

A description of the air or atmosphere; aërology.

That department of physics which treats of the atmosphere.

Divination from the state of the air or from atmospheric substances; also, forecasting changes in the weather.

The observation of the state and variations of the atmosphere.

The atmosphere. [R.]

The fluid which we breathe, and which surrounds the earth; the atmosphere. It is invisible, inodorous, insipid, transparent, compressible, elastic, and ponderable.