Réaumur scale
Sign in to savetemperature scale in which water freezes and boils at 0 and 80 degrees, respectively
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Old thermometer in a pharmacy in Vienna, showing room temperature by Réaumur scale. Réaumur and Celsius scale on thermometer. Private collection, central Europe. The Réaumur scale ( French pronunciation: [ʁeomy(ː)ʁ]; °Ré, °Re, °r), also known as the "octogesimal division", is a temperature scale for which the freezing point and boiling points of water are defined as 0 and 80 degrees respectively. The scale is named for René Antoine Ferchault de Réaumur, who first proposed a similar scale in 1730.
Change in scale