Rarefaction
Rarefaction (rar`e*fak"shun) , noun
[Compare French raréfaction. See Rarefy.]
The act or process of rarefying; the state of being rarefied; -- opposed to condensation; as, the rarefaction of air.
Rarefaction (rar`e*fak"shun) , noun
[Compare French raréfaction. See Rarefy.]