Experiments on osmosis with magnetic fluid.
Experiments on a ferromagnetic colloidal fluid at equilibrium showed equality between magnetic and osmotic force; this result identifies solute pressure against the free surface as the cause of the negative solvent pressure. Except for water of hydration, there is no other osmotic interaction between solute and solvent.
Scripps Institution of Oceanography, University of California, San Diego, Calif. 92037.
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Scholander
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Perez