In a recent article (1) Michael Laing claim that if two liquids are made up of molecules that have exactly the same intermolecular cohesive attractions, molecules of both liquids should have the same escape velocities, regardless of mass. His argument is that the process of molecules breaking losse from attractive forces holding them in the liquid is not unlike that of a satellite breaking free of the earth's gravitational field. While it is true that all satellites have the same escape velocity, independent of mass, it is not true for molecules evaporating from a liquid.
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