Methane/hydrogen mixtures are a promising kind of fuel for automobile, water and railway transport, supersonic aircraft, and rocket engineering. We have used the differential capillary method to measure the capillary constant a(2) and calculate the surface tension sigma in the temperature range from 95 to 176 K and the pressure range from that of the saturated vapors of pure methane to 4 MPa. Equations have been derived which describe the temperature, baric and concentration dependences of a(2) and sigma. The adsorption has been determined. The results of measurements are discussed in the framework of thermodynamic models of the theory of surface phenomena. (C) 2017 Elsevier Ltd. All rights reserved.