**Relation between Moisture Regain and Moisture Content**

**Moisture regain **Moisture regain is defined as the weight of water in a material as a percentage of the oven dry weight. Let, Oven dry weight of a material = D Weight of water in this material = W W **Moisture regain, R** = **……** X 100 …….(1) D
**Moisture content: **Moisture content is defined as the weight of water in a material express as a percentage of the total weight of the material. W **Moisture content, C** = **………..** X 100 ……………(2) W+D From equation (1) we get, W D = **……** X 100 R Putting the value of D in equation (2) we get, W C = **………………………… ** X 100 W + { (W/R) X 100} W => C = **…………………** W (1+100/R) 100 => C = **………………** 1 + 100/R 100R => C = **………… ** ………..(3) R+100 Again from equation (3) we get, RC + 100C R = **………………** 100 => R = C + RC/100 => R – RC/100 = C => R (1-C/100) = C C => R = **…………** 1-C/100 100C => R = **………. ** ………..(4) 100-C Equation (3) and (4) express the relation between Moisture regain and Moisture content.

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