# Textile Calculation

Problems and solutions of textile

## Relation between Moisture Regain and Moisture Content

Relation between Moisture Regain and Moisture Content
Abdullah Nur Uddin Rony
BTEC, 2nd Batch

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.