What are the two specific heat capacities of a gas and why are they different?

An Introduction to Physical Science
14th Edition
ISBN:9781305079137
Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Chapter5: Temperature And Heat
Section: Chapter Questions
Problem 12SA: Compare the SI units of specific heat and latent heat and explain any differences.
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What are the two specific heat capacities of a gas and why are they different?

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Specific heat capacity is the amount of heat energy required to raise the temperature of unit mass by unit degree Celsius. There is specific heat capacity at constant volume and specific heat capacity at constant pressure. Specific heat at constant pressure is greater than that at constant volume. This is because the at constant pressure, heat energy is not only used to raise the temperature, but also to do the external work.

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