Structure of Liquids. III. An X-Ray Diffraction Study of Fluid Argon

X‐ray diffraction measurements were made on argon at 13 states in the general critical region on a density—temperature grid covering the range $\text{0.280\hspace{0.17em}}\mathrm{g/cc}⩽\mathbf{\rho ̄}\text{⩽0.982\hspace{0.17em}}\mathrm{g/cc}$ and −130°C≤T≤−110°C. Features of the intensity patterns vary rather simply with density and only weakly with temperature. Computed values of the radial distribution functions show similar dependence on T and $\mathbf{\rho ̄}$ . The first three maxima in the distribution functions are at average locations of 3.90, 7.51, and 10.9 Å.