›› Convert degree RÝmer to degree Rťaumur


degree RÝmer
Reaumur


›› More information from the unit converter

How many degree RÝmer in 1 Reaumur? The answer is 0.42.
We assume you are converting between degree RÝmer and degree Rťaumur.
You can view more details on each measurement unit:
degree RÝmer or Reaumur
The SI base unit for temperature is the kelvin.
1 kelvin is equal to 0.525 degree RÝmer, or 1.25 Reaumur.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between degrees RÝmer and degrees Rťaumur.
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›› Common temperature conversions

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


›› Definition: Romer

RÝmer is a disused temperature scale named after the Danish astronomer Ole Christensen RÝmer, 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. RÝmer 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 RÝmer degree, is 40/21sts of a kelvin (or of a Celsius degree). The symbol is sometimes given as įR, but since that is also sometimes used for the Rankine scale, the other symbol įRÝ is to be preferred. The name should not be confused with Rťaumur.

Daniel Gabriel Fahrenheit learned of RÝmer'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 Rťaumur scale is a temperature scale named after Renť Antoine Ferchault de Rťaumur, who first proposed it in 1731. The freezing point of water is 0 degrees Rťaumur, the boiling point 80 degrees Rťaumur. Hence, a Reaumur degree is 1.25 Celsius degrees or kelvins. The Rťaumur temperature scale is also known as the octogesimal division (division octogesimale in French).

Rťaumur's thermometer was constructed on the principle of taking the freezing point of water as 0į, 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 80į. Mercurial thermometers, the stems of which are graduated into eighty equal parts between the freezing and boiling points of water, are not Rťaumur thermometers in anything but name. Rťaumur 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 Rťaumur 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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