The Réaumur scale is a way of measuring temperature. The unit associated with the scale is called "Réaumur", named after the physicist René-Antoine Ferchault de Réaumur who created it in 1731. The unit is usually abbreviated "Ré", sometimes "r". The two base points of the scale are the melting point of ice and the boiling point of water, both at normal pressure. There are 80 degrees between those values, one degree Réaumur is the 80th part of that temperature difference.