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.
As the wikipedia starts saying, the Gas Mark temperature scale is used on gas ovens and cookers in the United Kingdom, Ireland and some Commonwealth of Nations countries introduced by L. Chatterton's book Modern Cookery in 1943. The unit is represented by the capital letter G after the value, fixing the degree of 1 G at 275 ℉, and each increment is equivalent to 25 ℉.
Gas Mark values are calculated from Kelvin values following the formula $${{Kelvin - 394.15} \over 14}$$
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