Che (Spanish pronunciation: [tʃe], Portuguese: tchê, IPA: [ˈtʃe]; Valencian: xe, IPA: [ˈtʃe]) is a Spanish diminutive interjection (a vocative expression) commonly used in Valencian Community, Argentina and Uruguay. It is a form of colloquial slang used in a vocative sense as "friend", and thus loosely corresponds to expressions such as "mate", "pal", "man", "bro", or "dude", as used by various English speakers. As a result, it may be used either before or after a phrase: "Man, this is some good beer", or "Let's go get a beer, bro." It can be added to an explicit vocative to call the attention...

This article is about the phenomenon where a liquid can exist in a metastable state above its boiling point. See superheated water for pressurized water above 100˚C. See superheater for the device used in steam engines. In physics, superheating (sometimes referred to as boiling retardation, or boiling delay) is the phenomenon in which a liquid is heated to a temperature higher than its boiling point, without boiling. Superheating is achieved by heating a homogeneous substance in a clean container, free of nucleation sites, while taking care not to disturb the liquid. == Cause == Water is said...