Maxwell's demon

Etymology
and demon, and probably from Greek daemon, a mythological being intermediate between gods and men.

Noun

 * 1) A hypothetical creature created for a thought experiment. Maxwell’s demon, if it existed, would act as a sort of gate guard by sorting between higher-energy molecules and lower-energy molecules within an enclosed space. Because such a sorting process would tend to decrease entropy, it would violate the second law of thermodynamics.

Translations

 * Catalan: dimoni de Maxwell
 * Chinese:
 * Mandarin: 麥克斯韋妖
 * Finnish: Maxwellin demoni
 * German: Maxwellscher Dämon
 * Hungarian: Maxwell-démon
 * Japanese: マクスウェルの悪魔
 * Korean: ^맥스웰의 도깨비
 * Spanish: demonio de Maxwell