Heat capacity ratio

Thermodynamic quantity

In thermal physics and thermodynamics, the heat capacity ratio, also known as the adiabatic index, the ratio of specific heats, or Laplace's coefficient, is the ratio of the heat capacity at constant pressure to heat capacity at constant volume. It is sometimes also known as the isentropic expansion factor and is denoted by γ (gamma) for an ideal gas or κ (kappa), the isentropic exponent for a real gas. The symbol γ is used by aerospace and chemical engineers. where C is the heat capacity, the molar heat capacity, and c the specific heat capacity of a gas. The suffixes P and V refer to constant-pressure and constant-volume conditions respectively.

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