495. What is the Reaumur Scale for temperature and how does it compare to degrees F, C, and K?
The Reaumur Scale was created in 1730 by French scientist Rene-Antoine Ferchault de Reaumur, who set 0 R as the freezing point of water and 80 R as the boiling point of water. Though in common use for a time, the Reaumur Scale had more or less disappeared by the end of the eighteenth century. Each degree R is equal to 5/4 of a degree C, so T(C)=T(R)*5/4. Similarly, T(F)=T(R)*9/4+32 and T(K)=T(R)*5/4+273.15.