The Kelvin temperature scale was described by William Thomson, 1st Baron Kelvin in his paper of 1848 On an Absolute Thermometric Scale the idea of starting to measure the temperature from the zero absolute or where the atomic particles just stop moving. The letter K represents its unit after the value.
The Celsius or centigrade temperature scale is based on the water tristate, placing the 0 at the point when the liquid water becomes ice, and the 100 at the point when the liquid water becomes gas, both at 1 atm pressure. Its unit is represented with ℃ after the value.
The scale unit length is using the same unit than Celsius degrees, and allocates its 0 K in the -273.15 ℃.
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