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Water Sorption by Dry Milk Solids. III. A Comparison of Results Obtained by the Cryoscopic, Vapor Pressure, and Volume Contraction Methods

University of California

ABSTRACT

1. Comparisons are given for the degree of sorption of dry milk solids as determined by the cryoscopic, the vapor pressure, and the volume contraction methods.
   
2. It is shown that there is qualitative agreement among the methods for differently processed samples, but the values differ in magnitude depending upon the method used.
   
3. The cryoscopic results for each sample are greater than those by the other methods, and the results by the vapor pressure method at 80 per cent relative humidity are the smallest.
   
4. Some possible reasons for the differences are discussed.