What is Kelvin and Why 273 Kelvin is used for temperature conversion

Celsius, Fahrenheit and Kelvin are the units for measuring temperature. A temperature value can be expressed in any one or all of the above units independently. The values can be converted from one unit to other unit still keeping the meaning same.

We use the number 273 (273.15 exactly) to convert from Celsius to Kelvin and vice versa.

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