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The Celsius temperature scale is based on the properties of water. At one standard atmosphere of pressure, water melts/freezes at 0 °C and vaporizes/condenses at 100 °C.

Celsius is related to the Kelvin scale by the following formula: $ ^\circ C=K-273.15 $

Celsius is related to the Fahrenheit scale by the following formula:

$ ^\circ C\frac{9}{5}+32=^\circ F $