Ortho-para conversions in liquid hydrogen accompanied by the release of heat have a noticeable effect on the liquid hydrogen thermodynamic properties. This effect has an essentially quantum nature and is of great practical importance. Liquid-vapour phase equilibrium and surface properties of hydrogen have been investigated in this paper as a function of ortho-para composition. Differneces in the following properties of H_2 modifications have been detecteda nd analyzed: density, saturated vapour pressure, critical parameters and surface tension.
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