reamur

The Réaumur scale is a temperature scale that was invented in 1730 by French naturalist René Antoine Ferchault de Réaumur. It was one of the first widely used temperature scales. On the Réaumur scale, the freezing point of water is 0 degrees and the boiling point is 80 degrees. This means that each degree Réaumur represents 1/80 of the temperature difference between the freezing and boiling points of water.

The Réaumur scale was largely replaced by the Celsius scale, which was developed by Swedish astronomer Anders Celsius in 1742. The Celsius scale also uses the freezing point of water as 0 degrees, but its boiling point is 100 degrees. This means that each degree Celsius represents 1/100 of the temperature difference between the freezing and boiling points of water.

Despite being largely obsolete, the Réaumur scale is still used in some parts of the world, particularly in some European countries. It is also still used in some scientific applications, such as in the study of animal physiology.

To convert from Réaumur to Celsius, one can use the following formula: C = R * (100/80) or C = R * 1.25. To convert from Celsius to Réaumur, one can use the following formula: R = C * (80/100) or R = C * 0.8.