plural of atmospheric railway

A kind of steam engine in which the steam is admitted only to the underside of the piston.

A hammer driven by means of compressed air.

A railway where the motive power is derived from partial vacuum acting on a piston working in a tube of uniform bore.

plural of atmospheric pressure

(chemistry) The oxygen molecule O₂, as opposed to the element O.

The apparent angular elevation of the heavenly bodies above their true places, caused by the refraction of the rays of light in their passage through the Earth's atmosphere.

(meteorology) The mesosphere and stratosphere

(meteorology) The troposphere and lower stratosphere

(physics, meteorology) The pressure caused by the weight of the atmosphere above an area.