Abstract
The results of measuring the capillary constant of n-butane + hydrogen and n-butane + helium solutions are presented. The measurements were carried out by a differential version of the capillary rise method in the temperature range of 138–408 K at pressures from the saturation vapor pressure of a pure solvent to 4 MPa. The uncertainty of the calculated values is uc(a2)=0.019 mm2 (n-butane + helium solution) and uc(a2)=0.015 mm2, uc(γ)=0.034 mN/m (n-butane + hydrogen solution).The surface tension of the n-butane + hydrogen solution was determined. Equations are proposed that describe the concentration and pressure dependences of the capillary constant and surface tension. A qualitatively different effect of small additions of hydrogen and helium on the surface tension of n-butane has been established.
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