Experimental Heat Capacity of Pure LiquidHe3

Measurements of the heat capacity of pure ${\mathrm{He}}^3$ at 0.24 atm obtained by a differencing method are presented for the temperature range from 20-150 m°K. The temperature scale $T^{*}$ used is that valid for powdered cerium magnesium nitrate in the form of a right circular cylinder with diameter equal to height. There is excellent agreement between the present and earlier measurements. Considering all low-pressure difference data we find that from 6-125 m°K the ratio of heat capacity to magnetic temperature decreases linearly with increasing temperature. The relationship of the measurements to the temperature scale and to theories of spin fluctuations in ${\mathrm{He}}^3$ is also discussed.