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Abstract
The microwave dielectric properties white fishmeal are investigated as functions of temperature and hydration. It is proposed that the observed loss factor (ε′) is a result of thermal excitation of monolayer water molecules into multilayer states. This explanation, plus the presence of relaxation processes, rise to the observed temperature dependence. A rough estimate for the heat of sorption from multilayer to monolayer is obtained as 6.4 kJ /mol.