rarefactions

When the atmosphere is of the same weight and density orer a considerable extent of the surface of the earth, there a calm will obtain: but if this equipoise is taken off, a stream of air, or. wind, is produced, stronger or weaker in proportion to the alteration made in the state of the atmosphere* There are direr* causes which make these alterations in the equipoise of the atmosphere, such as rarefactions or conden - sations in one part more than in another; yapoura rising from the earth or sea, pressure of the clouds, &c.

The Complete Weather Guide: A Collection of Practical Observations for Prognosticating the ... Joseph Taylor, John Claridge 1812

If now our generalization is justified, once the emulsion is in equilibrium it will produce a miniature atmosphere of visible molecules where equal rises will be accompanied by equal rarefactions.

Jean Baptiste Perrin - Nobel Lecture 1965

Globule, is placed in a Position a little Warmer, than another the other, you see a Pulsation, caused by repeated rarefactions of the Spirits of

John Adams diary 40, 29 April - 22 May 1783 1961

Sound waves may be said to consist of a series of condensations and rarefactions, and the distance between two consecutive condensations and rarefactions may be defined as the wave length.

General Science Bertha M. Clark

In the hurricane there are short and fitful blasts inclined to the general direction of the wind, which must arise from the inertia of the moving mass of atmosphere, causing temporary condensations and rarefactions.

Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence T. Bassnett

When sound is propagated in air by alternate condensations and rarefactions, the temperature at each point instead of remaining unchanged, as Boyle's law supposed, is alternately raised and lowered about a mean value.

The Catholic Encyclopedia, Volume 12: Philip II-Reuss 1840-1916 1913

What occurs is that the vibrations of the sound-producer cause alternate condensations and rarefactions of the air.

Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. George Patterson 1910

In air, sound vibrations consist of successive condensations and rarefactions tending to proceed outwardly from the source in all directions.

Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. George Patterson 1910

In any tone having a fundamental and harmonics (multiples), the wave-train consists of a complex series of condensations and rarefactions of the air or other transmitting medium.

Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. George Patterson 1910

Alternate condensations and rarefactions of the air are made continuously by a sounding body.

The Wave Theory of Light Lord Kelvin 1909