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Relation between Moisture Regain and Moisture Content

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



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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