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Seasonal Variations in the Freezing Point of Milk

Department of Chemistry, Iowa State College, Ames, Iowa

ABSTRACT

1. There is a distinct seasonal variation in the freezing point depression of milk; the greater depression being in the spring months, the lower portion during the winter months.
   
2. Change in meteorological conditions offer an explanation of the wide variations of the freezing points encountered from day to day.
   
3. The seasonal variation of the freezing point depression is due to a change in the osmotic equilibrium maintained in the body of the animal. While meteorological changes may be a factor, the change in chemical content of the animal's food during the season is the controlling factor in the seasonal variation of the freezing point.