Relationship Between Water Activity and Freezing Point Depression of Food Systems
Florida Agricultural Experiment Station Journal Series No. 7055
A simplified freezing point depression (FPD) equation was derived for calculating water activity (aw) of food systems. The aw values as calculated by FPD data agreed with literature data for a variety of foods to within ± 0.01 aw units. The FPD equation was found particularly useful for calculating aw values of frozen foods at temperatures between 273.1.5–233.15 °K (0 to −40°C).