rar·e·fac·tion /ˌrærəˈfækʃən, ˌrɛr-/
變成稀薄,稀薄化,稀薄
rar·e·fac·tion /ˌrærəˈfækʃən, ˌrɛr-/ 名詞
稀疏,疏鬆,稀疏狀態,疏鬆狀態
Rar·e·fac·tion n. The act or process of rarefying; the state of being rarefied; -- opposed to condensation; as, the rarefaction of air.
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rarefaction
n : a decrease in the density of something; "a sound wave causes
periodic rarefactions in its medium"