Explain heat capacity at constant volume and at constant pressure?
Question: Explain heat capacity at constant volume and at constant pressure?
Heat capacity is a measure of the amount of heat required to change the temperature of a given mass of a substance by a given amount. The unit of heat capacity is J/(kg. K). At constant pressure, heat capacity increases with increasing temperature, since with increasing temperature the particles have more energy and can thus absorb more energy than at lower temperature. At constant volume, heat capacity decreases with increasing temperature, since at higher temperature the particles have more energy and can thus break the bonds with greater energy and hence the entropy will increase. To put it simply, at constant volume, heat capacity is inversely proportional to temperature, whereas at constant pressure, it is directly proportional to temperature.
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