Celsius (used to be called 'Centigrade')
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This is the Celsius scale, commonly used in the metric system for measuring temperature.
This scale is the Fahrenheit scale, commonly used in the United States.
At STP (that's your next question) water boils at 212 degrees and freezes at 32 degrees.
Water freezes at 0 degrees Celsius and boils at 100 degrees Celsius under normal atmospheric pressure.
Water boils at 100 degrees Celsius and freezes at 0 degrees Celsius.
On the Kelvin scale, water boils at 373.15 K.