Acetic acid is a commonly used name, is also the International Union of Pure and Applied Chemistry (IUPAC) under the official name. Commonly known as acetic acid (acetic acid), the name comes from the Latin word in the expression of vinegar "acetum". Anhydrous acetic acid at temperatures slightly below room temperature (16.7), can be transformed into a kind of corrosive ice-like crystals, so always said anhydrous acetic acid as acetic acid.