adiabatic index adiabatic index /ˌædɪəˈbætɪk ˈɪndɛks/

noun

1. The ratio of the heat capacity at constant pressure (C_P) to heat capacity at constant volume (C_V).  ( adiabatic index , heat capacity ratio )
   the ratio of the heat capacity at constant pressure (C_P) to heat capacity at constant volume (C_V).
    The experimental value for the heat capacity ratio of argon is the same as the theoretical heat capacity ratio.
   The experimental value for the heat capacity ratio of argon is the same as the theoretical heat capacity ratio.