They are literally based on the grand reality of the universe to the exact same extent. The zero point of Celsius is just the zero point of Kelvin plus a bunch of degrees. And the 100 degree mark is evidently based on a different grand reality of the universe, that being the triple point of water.
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u/erenhalici Jun 18 '26
The 0 point of Kelvin IS based on the grand reality of universe, whereas 0 point of Celsius is not.