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But the kelvin has me stumped. The nearest I have come is the internal
energy of an ideal monatomic gas, U=(3/2)nRT, but this does not give a
definition of the kelvin in terms of the meter, kilometer, and second, and
is only true for ideal and monatomic gases. Real gases and molecular
gases contain different amounts of energy even while they are in thermal
equalibrium, i.e.; at the same temperature. Is not the kelvin as
fundamental as the other four units?
Joe D. Darling