The Réaumur temperature scale was proposed by René Antoine Ferchault de Réaumur in 1730, and it is based on the water tristate as well as Celsius, placing the 0 at the point when the liquid water freezes, and the value of 80 at the point when the liquid water boils. Its unit is represented with °Ré, with °Re, and sometimes with °r after the value.
The Celsius or centigrade temperature scale is based on the water tristate, placing the 0 at the point when the liquid water becomes ice, and the 100 at the point when the liquid water becomes gas, both at 1 atm pressure. Its unit is represented with ℃ after the value.
The Celsius temperature scale values are calculated from Réaumur using the formula $$Réaumur × {5 \over 4}$$
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