Wednesday, 21 October 2015

thermodynamics - Are there any known negative heat capacities?



If we take heat capacity to be defined as "the ratio of the heat added to the temperature rise":


$$ C=\frac{\text{d} Q_{rev}}{\text{d}\theta}$$


then this leads me to ask: can this ever be negative? That is to say, are there any materials which cool as you add heat to them?




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