A set of drying tests were performed in a lab dryer by using air with dry and wet bulb temperature 60C and 45C, respectively. The air was passed over, one of the sides,cardboard layers of 20cm, 25cm5cm at constant conditions. The following data was found: The solid was finally dried at a high temperature to have a total weight of 115g The solid was finally dried at a high temperature to have a total weight of 115g 1. Build the drying curve (-dX/dt vs X, and total weight vs time, W vs X ) for the given conditions 2. What are the humidity at equilibrium and critical humidity? 3. What is the drying rate during the constant stage