Experimental Determination of the Molar Volume and Derivation of the Expansion Coefficient, Entropy Change on Compression, Compressibility, and First-Sound Velocity for Liquid He-3 from 35 to 1200 mK and from the Saturation Pressure to 24 atm

The molar volume of liquid He-3, V(P, T), was determined from measurements of the dielectric constant over the temperature range 35-1200 mK and from the vapor pressure to 24 arm. Analytical expressions were fitted to the molar volumes in order to calculate the isobaric expansion coefficient alpha(p), the isothermal compressibility kappa(T), and the first-sound velocity c(1); the expansion coefficient was integrated numerically to arrive at the entropy change on compression. Values of V(P, T) and the derived quantities are presented in tabular form at even temperatures and pressures. From this work it was found that V(0, 0)=36.873 +/- 0.015 cm(3)/mole and that c(1)(0,0) = 178.4 m/sec, about 2.5% lower than the presently accepted value of 183.4 m/sec.