抄録
Nonlinearity parameter is computed for the “Rao liquid”, i.e., a liquid with molecular sound velocity independent of both temperature and pressure, with the result B/A=6. As the Rao liquid is representative of common organic and inorganic liquids excluding highly associated ones, it is concluded that liquids are far more nonlinear than gases for which B/A=γ−1=0.67 at most, where γ means the ratio of the specific heats.
