How many degree Réaumur in 1 degree Rankine?
The answer is 0.694444444444.
We assume you are converting between degree Réaumur and degree Rankine.
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degree Réaumur or degree Rankine
The SI base unit for temperature is the kelvin.
1 kelvin is equal to 1.25 degree Réaumur, or 1.8 degree Rankine.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between degrees Réaumur and degrees Rankine.
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The Réaumur scale is a temperature scale named after René Antoine Ferchault de Réaumur, who first proposed it in 1731. The freezing point of water is 0 degrees Réaumur, the boiling point 80 degrees Réaumur. Hence, a Reaumur degree is 1.25 Celsius degrees or kelvins. The Réaumur temperature scale is also known as the octogesimal division (division octogesimale in French).
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 2 times (50, 25).
The Réaumur 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.
Rankine is a thermodynamic (absolute) temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859.
The symbol is °R (or °Ra if necessary to distinguish it from the Rømer and Réaumur scales). As with the Kelvin scale (symbol: K), zero on the Rankine scale is absolute zero. The Rankine scale differs from the Kelvin scale in that it uses smaller, degree Fahrenheit-size increments rather than degree Celsius-size increments. A temperature of 459.67 °R is precisely equal to and 0 °F.
Many engineering fields in the U.S. measure thermodynamic temperature using the Rankine scale. However, throughout the scientific world where measurements are made in SI units, thermodynamic temperature is measured in kelvins.
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