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I'm reading through Zwiebach's String Theory text on my own and am thinking about one of his very elementary exercises on "units." We are asked to define temperature in Kelvin with reference to the fundamental units of mass, length, and time. My thought is the following:

We take kT=hf where here f is the frequency of oscillation of Cs-133 radiation at that temperature since that is how the "second" is defined. Then we will have defined the temperature T (in Kelvin) in terms of only numerical quantities whose value we know (k and h) and f.

I'm not very confident about this at all but I'm not sure how else to do it.