PHYSICAL METHODS 1. Infrared Method: Absorption Method - measuring the absorption of OH group at wavelength of 2.8 m. Common Method - 1 ppm (sensitivity) 0 20 40 60 80 100 15 30 45 60 75 % Moisture by Oven Method m.PHYSICAL METHODS 1. Infrared Method: Absorption Method - measuring the absorption of OH group at wavelength of 2.8 m. Common Method - 1 ppm (sensitivity) 0 20 40 60 80 100 15 30 45 60 75 % Moisture by Oven Method m