A sound-wave consists essentially of two parts — a condensation and a rarefaction.
With these pumps a higher degree of rarefaction can be obtained.
Now here, certainly, there must be evidence of the truth of the rarefaction theory, if any where on the face of the earth.
This is precisely what is meant by rarefaction and condensation.
It would seem to be impossible for any man to believe in the theory of rarefaction, after an examination of these tables.
The ends of the strip suffer neither condensation nor rarefaction.
Indicate the parts of the curve that correspond to a condensation and to a rarefaction.
Air, therefore, rushes towards those parts where a degree of vacuity or rarefaction has been produced.
We threw over part of our ballast, and mounted up till the cold and the rarefaction of the air became very troublesome.
Anaximenes — adopted Air as ἀρχή — rise of substances out of it, by condensation and rarefaction.
c.1600, from Middle French raréfaction or directly from Medieval Latin rarefactionem (nominative rarefactio), noun of action from past participle stem of Latin rarefacere (see rarefy). Used chiefly in reference to gasses.
rarefaction rar·e·fac·tion (râr'ə-fāk'shən)
A decrease in density and pressure in a medium, such as air, caused by the passage of a sound wave.