**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.