but use equations and Fig. 9.5.1b

Time of Drying from Drying Curve A solid whose drying curve is represented by Fig. 9.5-1a is to be dried from a free moisture content X1=0.38kgH2O/kg dry solid to X2=0.25kg H2O/kg dry solid. Estimate the time required. Free moisture X(kgH2O/kg dry solid)