Volumetric heat capacity, often denoted as \( C_v \), is a measure of a material's ability to store thermal energy per unit volume for a given temperature change. It quantifies how much heat is required to raise the temperature of a unit volume of a substance by one degree Celsius (or one Kelvin).
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Volumetric heat capacity is heat capacity per unit volume, with units . For homogeneous material of mass density , it equals , using specific heat capacity for the same constraint. It measures the heat required per small temperature increase for a chosen occupied volume. In a material model using specific heat capacity at constant pressure, thermal diffusivity is , where is thermal conductivity.