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Celsius: A temperature change of 1° C is equivalent to 1.8°F. Celsius was originally defined by the freezing point of water as 0 deg C. However, now the scale is defined relative to the Kelvin temperature scale.
Fahrenheit: A temperature change of 1°F is equivalent to 0.556°C. In Fahrenheit measurements, the freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point of water is 212 degrees (at standard atmospheric pressure). The boiling and freezing points are exactly 180 degrees apart.
Kelvin: Kelvin is most often used for scientific purposes. Zero degrees Kelvin is refered to as "absolute zero", the point at which all thermal motion stops.