Specific Heat Capacity of a Gas

This short heading introduces a fact unique to gases: unlike solids and liquids, which effectively have just one specific heat capacity, a gas has two distinct specific heat capacities, because heating it can be done either at constant pressure or at constant volume, and these two situations require genuinely different amounts of heat -- developed in the next two subsections, 8.7.1 (defining $s_p$, $s_v$, $C …