Abstract
The relative density of the superfluid component of 3He is expected to be significantly depressed by flow. For this reason the distortion of a finite amplitude fourth sound wave exhibits an unusual amplitude dependence. For waves of sufficiently large initial amplitude, a fully developed shock wave will contain two discontinuities per wavelength. Calculations which determine the threshold amplitude are presented and comparisons with thermodynamic data suggest that waves of sufficient amplitude should be experimentally accessible. A tabulation of the most recent thermodynamic data for 3He is included.
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