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# Heat capacity

Heat capacity or thermal capacity is the ability of an object to store heat. It is abbreviated to Cth, and its SI units are J/K (joule per kelvin). The concept is further discussed in the article on temperature.

Heat capacity is related to thermal capacitance[?] by the formula

$C_{th} = V \rho c_p$

where

V = volume (m3)
ρ = density (kg/m3)
cp = specific heat (J/kgK) at constant pressure

The product ρcp is known as thermal capacitance or (confusingly) thermal capacity, and has units of J/m3K. Dulong[?] and Petit[?] predicted in 1818 that ρcp would be constant for all solids (the Dulong-Petit law). In fact, the quantity varies from about 1.2 to 4.5 J/m3K. For fluids it is in the range 1.3 to 1.9, and for gases it is a constant 0.001 J/m3K.

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