Osmotic Electric or Magnetic Field

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Abstract
The usual osmotic pressure method for the determination of molecular weights becomes inaccurate when applied to solutes with high molecular weights because the solvent chemical potential is too sensitive to pressure changes. Since the solvent chemical potential is much less sensitive to changes in electric or magnetic field, the suggestion is made that these variables might be useful in osmotic experiments. A few schematic arrangements and a numerical example are discussed. Any possible advantage of the proposed method, over the conventional osmotic pressure method, rests on the replacement of a measurement of a small pressure difference by the measurement of a sizable electric or magnetic field coupled with a null observation on the pressure difference.

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