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Temperature conversion refers to the methods for converting temperature values expressed in one unit to values expressed in another unit. The four most widely used temperature measurement units are those of the Kelvin, Celsius, Fahrenheit and Rankine temperature scales. This article defines and compares the four scales and also provides the methods for converting temperatures from any one of those four scales to the other three.

Definition of the temperature scales and their reference points

Table 1 below defines and compares the Kelvin, Celsius, Fahrenheit and Rankine temperature scales in terms of their three reference points, namely their values at absolute zero, the melting point of water and the boiling point of water:

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Conversion methods


Table 2 presents the the simple equations used to convert temperatures from any one of the four scales to the other three:
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