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Raumur - This article is about the temperature scale. Raumur is also the name of a commune in the Vende dpartement, in France; see Raumur (commune).
The degree Raumur is a unit of temperature named after Ren Antoine Ferchault de Raumur, who first proposed it in 1731. The freezing point of water is 0 degrees Raumur, the boiling point 80 degrees Raumur. Hence a degree Reaumur is 1.25 degrees Celsius or kelvins. The Raumur temperature scale is also known as the "division octogesimale" or "octogesimal division". Raumur's thermometer was constructed on the principle of taking the freezing point of water as 0, and graduating the tube into degrees each of which was one-thousandth of the volume contained by the bulb and tube up to the zero mark. It was the dilatability of the particular quality of alcohol employed which made the boiling point of water 80; and mercurial thermometers the stems of which are graduated into eighty equal parts between the freezing and boiling points of water are not Raumur thermometers in anything but name. The Raumur scale saw widespread use in Europe, particularly in France and Germany, but was eventually replaced by the Celsius scale. Today it is of historical significance. External link
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