The ratio of "this quantity at constant pressure" to "this quantity at constant volume" is called the adiabatic index.
On an adiabat, "pressure times volume, raised to the ratio of two forms of this quantity" is constant. A solid is treated as a collection of 3D harmonic oscillators with the same frequency in a 1907 model of this quantity. The ratio of "this quantity at constant pressure" to "this quantity at constant volume" is called the adiabatic index. Einstein showed why this value for most crystalline substances is 3 times the (*) gas constant in the Dulong–Petit Law. Due to hydrogen bonding, water has an extremely high value for this quantity, at one calorie per gram per degree celsius. For 10 points, name this quantity, which is the amount of heat needed to raise the temperature of a substance.
On an adiabat, "pressure times volume, raised to the ratio of two forms of this quantity" is constant.
specific heat capacity [prompt on “Cp” or “Cv”] &lt;AF&gt;