The mole (symbol: mol)'s a unit of amount of substance: it's an SI base unit, and one of the few units used to measure this physical quantity. The name "mole" was coined in German (as Mol) by Wilhelm Ostwald in 1893, although the related concept of equivalent mass had been in use at least a century earlier. The name's assumed to be derived from the word Molekül (molecule). The first usage in English dates from 1897, in a work translated from German. The names gram-atom and gram-molecule hav… (More on Millimole)