Why do we use Kelvin as an si unit to calculate temperature?
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It allows you to do math with it as a unit.
Fahrenheit and Celsius both pick an arbitrary place to be “0 degrees” and then have negative temperatures. This makes math nonsensical, because 0 degrees Celsius is not “zero heat”, like absolute zero, it’s actually much warmer than that. And similarly, 20 degrees Celsius is not “twice as much heat” as 10 degrees Celsius. So “degrees” are not units of temperature you can easily do math with.
Kelvins start at 0 (absolute zero, the coldest temperature physically possible, anything below which cannot exist), and they’re units that you can do math with. 200 Kelvins is actually “twice as many units of heat” as 100 Kelvins.
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