Orthobaric Density ofHe3in the Critical Region

The coexistence curve of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ has been measured by a dielectric constant technique in the neighborhood of the critical point. The parameters in the relation $\left|\frac{(\rho -{\rho }_c)}{{\rho }_c}\right|=A{\left[\frac{(T_c-T)}{T_c}\right]}^{\beta }$ are found to be ${\rho }_c=0.04134\mathrm{}$ g/${\mathrm{cm}}^3$, $T_c=3.3095\mathrm{}°$K, $A=1.323\mathrm{}$, and $\beta =0.362\mathrm{}$. Our value of $T_c$ is some 14 mdeg lower than previous measurements indicate, and our value of $\beta$ more nearly in agreement with values characteristic of other fluids than was previously found.