The equilibrium water vapour pressure of frozen cod has been measured and found to be equal to that of ice at the same temperature. The concentration of solutes in unfrozen cod, calculated from a plot of the fraction of unfrozen water remaining and the relative lowering of the vapour pressure of supercooled water to that of ice at the same temperature, is equivalent to a 1.34% solution of sodium chloride. This value is in good agreement with values obtained by other workers.
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