The moisture content characterizes the state of thematerial, i.e., itswater content expressed in kg relatedto 1 kg of dried material. The equilibrium betweenthe atmosphere and the wet material is highly affectedby temperature. Knowledge of the correlationbetween the various factors influencing equilibriumhas primary importance for drying technology, sincethe air moistening state determines the final moisturecontent being reached at the drying temperature.The relationship among the three features of the statemakes it possible to have three types of planar representations
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