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by BurningFrog 3289 days ago
One answer is that there are SI units for a lot of derived units. A Watt is Joule/second, for example. But that's not what you're really asking.

Kelvin is considered one of the 7 base SI units, as described here: http://physics.nist.gov/cuu/Units/units.html

I think the mean kinetic energy of gas particles is impossible to measure directly. You can compute it by measuring the temperature though :)