›› Convert degree Rmer to degree Raumur


degree Rmer
degree Raumur


›› More information from the unit converter

How many degree Rmer in 1 degree Raumur? The answer is 0.42.
We assume you are converting between degree Rmer and degree Raumur.
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degree Rmer or degree Raumur
The SI base unit for temperature is the kelvin.
1 kelvin is equal to 0.525 degree Rmer, or 1.25 degree Raumur.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between degrees Rmer and degrees Raumur.
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›› Common temperature conversions

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


›› 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.


›› 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.


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