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One Celsius degree is equal to one [[Kelvin]], with an offset such that T(°C) = T(K) - 273.15.  So [[absolute zero]], 0 K, (the temperature at which there is no heat) is -273.15 degrees Celsius.

One Celsius degree is equal to one [[Kelvin]], with an offset such that T(°C) = T(K) - 273.15.  So [[absolute zero]], 0 K, (the temperature at which there is no heat) is -273.15 degrees Celsius.

Celsius is the commonly used unit of temperature in Europe, Canada, Mexico, most of Asia, South America, most of Africa and Australia but in the United States, Fahrenheit is still preferred.<ref>[https://www.cia.gov/library/publications/the-world-factbook/appendix/appendix-g.html] CIA World Factbook</ref>

Celsius is the commonly used unit of temperature in [[Europe]], [[Canada]], [[Mexico]], most of [[Asia]], [[South America]], most of [[Africa]] and [[Australia]] but in the [[United States]], Fahrenheit is still preferred.<ref>[https://www.cia.gov/library/publications/the-world-factbook/appendix/appendix-g.html] CIA World Factbook</ref>

''Centigrade'' is a term commonly used as a synonym of Celsius (it was the original term used before the scale was renamed to honor its founder), especially when giving weather temperature on the air.

''Centigrade'' is a term commonly used as a synonym of Celsius (it was the original term used before the scale was renamed to honor its founder), especially when giving weather temperature on the air.