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Celsius (more precisely, a degree Celsius), sometimes called centigrade, is a unit of measurement that is used in most countries to measure temperature. The unit was created by Anders Celsius (1701–1744), a Swedish astronomer.
0 °C is the melting point of pure water at sea level (normal atmospheric pressure), and 100 °C is the boiling point of water at sea level. (Water boils at a lower temperature at higher altitudes.)
1 °C is therefore a hundredth of that difference.
Since 1948, the unit has been called "Celsius." "Centigrade" was the name of the unit before the change, with "centi" meaning a hundredtand "grade" being a scale.
The other main measurement of temperature is the Fahrenheit scale, but it is less used. The Celsius scale, based on multiples of ten, is used with SI, or metric, measurements.
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