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Celsius used 0Â° for the boiling point of water and 100Â° for the melting point of snow. This was later inverted to put 0Â° on the cold end and 100Â° on the hot end, and in that form it gained widespread use. It was known simply as the centigrade scale until in 1948 the name was changed to the Celsius temperature scale.
The three most common temperature scales are Fahrenheit, Celsius and Kelvin. The illustration below shows identical liquid filled thermometers. Each is calibrated with one of the three temperature scales. The Fahrenheit and Celsius scales show the boiling point for water at 212oF and 100oC. The freezing point for water is 32oF and 0oC. The size of the degrees is different.