Abstract
LORD KELVIN'S very interesting problem concerning molecules which differ only in their power of passing a diaphragm (see NATURE for January 21, p. 272), seems only to require for its solution the relation between density and pressure for the fluid at the temperature of the experiment, when this relation for small densities becomes that of an ideal gas; in other cases, a single numerical constant in addition to the relation between density and pressure is sufficient.
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