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dimensionless temperature


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While pressure is clearly absolute (i.e., zero has a clear definition), temperature is most often with respect to some state (e.g., minimal crystalline structure). We can readily measure conditions and calibrate pressure instruments on an absolute basis. We don't have the same flexibility with temperature and so we recognize this in our measurements, calculations, and formulations. Also, heat is defined as that form of transient energy that crosses a system boundary by virtue of a temperature *difference*, not an *absolute* temperature.

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