Sound Dispersion in Ethane-Ethylene Mixtures and in Halo-Ethane Gases

Abstract

Sound dispersion is examined in ethane‐ethylene mixtures, in three halo‐ethane gases, and in a C₂H₆–CH₃CHF₂ mixture—all at room temperature. Double dispersion is observed whenever ethane is present and single dispersion for all other gases. The relaxation times and collision lifetimes are reported along with some discussion on the effectiveness of ethane‐ethane versus ethane‐ethylene collisions. For the halo‐ethane gases the exchange mode used should be the lowest mode of ``regular'' vibration, not the mode of hindered rotation. The free flow of energy that occurs between modes of vibration in the same molecule does not occur between the modes of vibration of two different molecules (C₂H₆–CH₃CHF₂) while in collision.