Everything about R Aumur Scale totally explained
» This article is about the temperature scale. For other uses, see Réaumur (disambiguation).
The
Réaumur scale (°Ré, °Re, °R), also known as the
octogesimal division, is a
temperature scale in which the
freezing and
boiling points of
water are set to 0 and 80 degrees respectively. The scale is named after
René Antoine Ferchault de Réaumur, who first proposed it in
1731.
Réaumur’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°.
Mercurial thermometers, the stems of which are graduated into eighty equal parts between the freezing and boiling points of water, are not Réaumur thermometers in anything but name. Réaumur may have chosen the octogesimal division because the number
80 could be halved 4 times and still be an
integer (
40,
20,
10,
5); the number
100, for instance, could only suffer this process twice (
50,
25).
The Réaumur scale saw widespread use in
Europe, particularly in
France and
Germany as well as
Russia, such as in works of
Dostoyevsky and
Tolstoy. But by the 1790s, France chose the
Celsius scale for the
metric system over the Réaumur measurements. Today it's only of historical significance except that it's still used in the measuring of milk temperature in cheese. It is used in some Italian dairies making
Parmiggiano-Reggiano and
Grana Padano cheeses and in Swiss Alp cheeses.
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