if you watch movies set in the future, or even star trek, they use kelvins, which is similar to Celsius, but also use metric, metres, kilometres and such, as they know that eventually it'll change
It actually makes sense, as Kelvin is the official scientific unit for temperature, and the metric system is used in science too. It's called the International System of Units, and in this system, every possible unit of measurement can be derived quite directly from seven base units, including the kelvin, the metre and the kilogram.
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