Heat capacity is related to thermal capacitance[?] by the formula
where
The product ρc_{p} is known as thermal capacitance or (confusingly) thermal capacity, and has units of J/m^{3}K. Dulong[?] and Petit[?] predicted in 1818 that ρc_{p} would be constant for all solids (the DulongPetit law). In fact, the quantity varies from about 1.2 to 4.5 J/m^{3}K. For fluids it is in the range 1.3 to 1.9, and for gases it is a constant 0.001 J/m^{3}K.
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