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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–N2 system is determined by the constant volume piezometer method. The amount of substance in the piezometer is measured by the volumetric method. He–Ne–N2 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: (xHe = 0.24; xN2 = 0.17), (xHe = 0.33; xN2 = 0.34), (xHe = 0.16; xN2 = 0.60). 70 experimental points on 7 isotherms were obtained.

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