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## Reaumur to kelvin conversion

The Reaumur scale (°Re, °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.

Reaumur’s thermometer contained diluted alcohol and 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. He suggested that the quality of alcohol employed be such that it began boiling at 80 °Ré — that is, when it had expanded in volume by 8%. He chose alcohol instead of mercury on the grounds that it expanded more visibly, but this posed problems: his original thermometers were very bulky, and the low boiling point of alcohol made them unsuitable for many applications. Instrument-makers generally chose different liquids, and then used 80 °Re to signify the boiling point of water, causing much confusion.

## $\frac{5}{4}r+273.15$

Here,r=reaumur

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