At"mos*phere (#), n. [Gr. vapor (akin to Skr. atman breath, soul, G. athem breath) + sphere: cf. F. atmosphere. See Sphere.]

1. Physics (a)

The whole mass of aeriform fluid surrounding the earth; -- applied also to the gaseous envelope of any celestial orb, or other body; as, the atmosphere of Mars.


Any gaseous envelope or medium.

An atmosphere of cold oxygen. Miller.


A supposed medium around various bodies; as, electrical atmosphere, a medium formerly supposed to surround electrical bodies.



The pressure or weight of the air at the sea level, on a unit of surface, or about 14.7 Ibs. to the sq. inch.

Hydrogen was liquefied under a pressure of 650 atmospheres. Lubbock.


Any surrounding or pervading influence or condition.

The chillest of social atmospheres. Hawthorne.


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.


© Webster 1913.