The image above represents the moisture regain.

To compute for moisture regain, two essential parameters are needed and these parameters are **mass of absorbed water in specimen (M _{W})** and

**mass of dry specimen (M**

_{D}).The formula for calculating moisture regain:

R = ^{MW} / _{MD} x 100

Where;

R = Moisture Regain

M_{W} = Mass of Absorbed Water in Specimen

M_{D} = Mass of Dry Specimen

Let’s solve an example;

Find the moisture regain when the mass of absorbed water in specimen is 13 and the mass of dry specimen is 21.

This implies that;

M_{W} = Mass of Absorbed Water in Specimen = 13

M_{D} = Mass of Dry Specimen = 21

R = ^{MW} / _{M}_{D} x 100

R = ^{13} / _{21} x 100

R = 0.619 x 100

R = 61.90

Therefore, the **moisture regain **is **61.90%.**

**Calculating the Mass of Absorbed Water in Specimen when the Moisture Regain and the Mass of Dry Specimen is Given.**

M_{w} = ^{RMD} / _{100}

Where;

M_{W} = Mass of Absorbed Water in Specimen

R = Moisture Regain

M_{D} = Mass of Dry Specimen

Let’s solve an example;

Find the mass of absorbed water in specimen when the moisture regain is 14 and the mass of dry specimen is 11.

This implies that;

R = Moisture Regain = 14

M_{D} = Mass of Dry Specimen = 11

M_{w} = ^{RMD} / _{100}

M_{w} = ^{14 x 11} / _{100}

M_{w} = ^{154} / _{100}

M_{w} = 1.54

Therefore, the **mass of absorbed water in specimen **is **1.54.**

Continue reading How to Calculate and Solve for Moisture Regain | Polymer & Textile