Velocity of Sound in Liquid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>at High Pressures

The velocity of 14-Mc/sec sound in liquid ${\mathrm{He}}^{3}$ was measured at pressures up to 9 atmospheres in the temperature range 1.2\ifmmode^\circ\else\textdegree\fi{}K to 3.2\ifmmode^\circ\else\textdegree\fi{}K. A few measurements were also made in the gas just above the critical temperature. A possible phonon contribution to the thermal coefficient of expansion of the liquid is discussed.

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