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Jan 23, 2020 · C = Q / ΔT. where C is heat capacity, Q is energy (usually expressed in joules), and ΔT is the change in temperature (usually in degrees Celsius or in Kelvin). Alternatively, the equation may be written: Q = CmΔT. Specific heat and heat capacity are related by mass: C = m * S. Re: Heat capacity at constant pressure vs at constant volume [ENDORSED] Post by Chem_Mod » Thu Jan 25, 2018 3:41 pm This is because to undergo the same change in temperature, more energy is needed in a constant pressure situation than constant volume due to the possibility of expansion work being done by the material upon heating.