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An experimental installation has been created at the Department of TOT to measure the density of ternary gas mixtures from 100 to 300 K and pressures up to 16 MPa. The experimental density for the He–Ne–N 2  system is determined by the constant volume piezometer method. The amount of substance in the piezometer is measured by the volumetric method. He–Ne–N 2  mixtures are prepared in a special mixer at 20°C for the  p - v - T  series of experiments, the concentrations are calculated using the equations of state of pure components. In the experiment, 3 mixtures were prepared, which had mole concentrations: (x He  = 0.24; x N 2 = 0.17), (x He  = 0.33; x N 2 = 0.34), (x He  = 0.16; x N 2 = 0.60). 70 experimental points on 7 isotherms were obtained.

An experimental study of the density of the helium – neon – nitrogen gas system at low temperatures