Measurements of the diffusion coefficients of hydrogen and methane instrong aqueous electrolytes have been made with the use of the diaphragm cell method. The variation of the diffusion coefficients with electrolyte concentration, type of ion, and temperature hos been studied over the electrolyte concentration range zero to saturated, and for temperatures in the range f Calculated from data of McCall and Douglass (11 ) for self-diffusion taken as being the average of the values for hydrogen and methane.of water.

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