What is the Expression of Moisture Content?

Moisture content, you would realize, is expressed in one of two ways i.e dry weight basis (dwb) or wet weight bases (wwb). Moisture content is calculated using the following formula:

m.c. (m) = (mass of water/ mass of sample) * 100

Where mass of sample can be made up of water and dry matter or solids. Thus

m.c. (m) = (mass of water/ mass of water + solids) * 100

On a dry weight basis, moisture is calculated as

M = mass of water/ mass of solid

The mechanism content on wet basis can be converted to dry basis vice versa using the following equations:

m = 100M / 1+M or M = m/100 (1-m/100)

Moisture content (w.w.b.) is most often used in food composition tables, whereas moisture (d.w.b.) is more often encountered with sorption isotherms and drying curves.