Celsius is a scale (sometimes called Centigrade) that is used in many countries as a unit of measurement for temperature. The Celsius scale was created by a Swedish astronomer called Anders Celsius.
On the scale, 0 degrees (°) Celsius is the melting point of pure water at sea level, at a normal pressure. 100° Celsius is the boiling point of water at normal pressure.
The other temperature scales include:
Fahrenheit, Kelvin, Reamur, Romer