›› Convert degree Raumur to degree Rmer

degree Raumur
degree Rmer

›› More information from the unit converter

How many degree Raumur in 1 degree Rmer? The answer is 2.3809523809524.
We assume you are converting between degree Raumur and degree Rmer.
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degree Raumur or degree Rmer
The SI base unit for temperature is the kelvin.
1 kelvin is equal to 1.25 degree Raumur, or 0.525 degree Rmer.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between degrees Raumur and degrees Rmer.
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›› Common temperature conversions

degree Raumur to Rankine
degree Raumur to Celsius
degree Raumur to newton
degree Raumur to kelvin
degree Raumur to Fahrenheit
degree Raumur to Delisle

›› Definition: Reaumur

The Raumur scale is a temperature scale 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 Reaumur degree is 1.25 Celsius degrees or kelvins. The Raumur temperature scale is also known as the octogesimal division (division octogesimale in French).

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. 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. Raumur 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 2 times (50, 25).

The Raumur scale saw widespread use in Europe, particularly in France and Germany, but was eventually replaced by the Celsius scale. Today it is only of historical significance.

›› Definition: Romer

Rmer is a disused temperature scale named after the Danish astronomer Ole Christensen Rmer, who proposed it in 1701.

In this scale, the zero was initially set using freezing brine. The boiling point of water was defined as 60 degrees. Rmer then saw that the freezing point of water fell at roughly one eighth of that value (7.5 degrees), so he used that value as the other fixed point. Thus the unit of this scale, a Rmer degree, is 40/21sts of a kelvin (or of a Celsius degree). The symbol is sometimes given as R, but since that is also sometimes used for the Rankine scale, the other symbol R is to be preferred. The name should not be confused with Raumur.

Daniel Gabriel Fahrenheit learned of Rmer's work and visited him in 1708; he improved on the scale, increasing the number of divisions by a factor of four and eventually establishing what is now known as the Fahrenheit scale, in 1724.

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