This comprehensive study covers basic principles of humidity include relative humidity & humidity chart, vapor-pressure curve of water, dew point and wet-bulb temperature. Mechanism of Drying has been clearly discussed in details. It also covers Drying Rate Curve and Moisture Content Curve including both constant rate period and falling rate period. Inside this book you find a wide and deep discussion about the Spray Drying & drying equipment . All Common type of dryers including Continuous Tunnel Dryer, Drum Dryer, Tray Dryer and Rotary Dryer has been mentioned with a detail description. Experimental work that included effect of boundary layer on drying mechanisms and Mechanisms of Single Droplet Drying has been discussed in deep with enough ullisturations and figures to understand mechanism of drying . This book is a valuable reference for any researcher or student interested in this subject.