Dielectric relaxation process of water was investigated for 30 wt% gelatin-water mixture at frequencies between 1 MHz and 50 GHz in subzero temperatures down to -50 oC. Below the melting temperature T
m, part of water crystallized and another part of water, uncrystallized water (UCW) , remained in a liquid state with gelatin in an uncrystallized phase. At T
m, the relaxation strength, relaxation time, and relaxation time distribution change adruptly, and their subsequent changes with decreasing temperature are larger than those above T
m. These large temperature dependences below T
m can explained by the increase in gelatin concentration in the uncrystallized phase C
g,UCP with decreasing temperature.
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