Smith Gibson

09/26/2024 · High School

\( 18-3 \) SPECIFIC HEATS OF A GAS The heat necessary to raise the temperature of agas depends on how the gas is confined. If the \( g^{2 s} \) is held at constant volume, as indicated in fig. 18 -la, the heat received is converted entirely into internal energy, in the form of molecular kinetic energy, thus raising the temperature. The heat per unit mass per degree required to raise the temperature of the gas under these conditions is called the specific heat at constant volume, co. When the gas is confined in a cylinder under a piston that maintains constant pressure (Fig. 18-1b), the gas will expand on being heated. It does work in moving the piston. Hence heat must be supplied to change the internal energy of the gas and to perform external work. The heat per unit mass per degree required to raise the tem- perature of the gas under constant pressure is