rarefaction

Etymology
From.

Noun

 * 1) A reduction in the density of a material, especially that of a fluid.

Translations

 * Bengali: তনুকরণ, তনুভবন
 * Bulgarian: разреждане
 * Chinese:
 * Mandarin: ,
 * Finnish:, , , ohentuminen
 * Macedonian: проретчување
 * Portuguese:
 * Russian:
 * Spanish:
 * Turkish: ,