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 Description  
 Celsius Degree:  The unit of temperature in the metric system.
The Celsius scale, initially called "centrigrade," was named after the Swedish astronomer, Anders Celsius, who invented it in 1742. Like the Fahrenheit scale, two reference temperatures are used with this scale. These are the freezing point of water (0 degrees Celsius) and the boiling point of water (100 degrees Celsius). True to the nature of the metric system, the Celsius scale has an interval from freezing to boiling that is a power of 10 (100 = 102). Although they are not drawn to scale, some other common temperatures are labeled on the thermometer below.