Water content, moisture content

Wet water content

Water content or moisture content on wet basis of a solid is the quantity of moisture in relation to its overall mass (gross mass, including water).
Example: 1kg wood with 40% water content consists of 0,4kg water and 0,6kg wood.

Solid biofuels - Fuels specifications and classes

The EN 14961-1 norm published in October 2010 specifies the water content of solid biofuels is to be measured on a wet sample, according to the oven dry method. The measured sample is weighed before and after the water content has been eliminated.

Dry water content

Moisture content on dry basis or dry water content refers to the relationship between the mass of water contained in the material and the dry mass of the material.
Example: 6kg Wwood with 0,4kg water. The 0,6kg wood represents 100%, so the 0,4kg water is 66,7% wood moisture.

Comparison of moisture content

- on wet basis as received/dry basis (mass %)

12/13.64 - 25/33.33 - 37/53.85

- on dry basis as received/wet basis (mass %)

12/10.71 - 25/20.00 - 37/27.01 - 46/31.51 - 54/35.06

The relation between moisture on dry basis, or wet basis, expressed as a percentage by mass shall be calculated according to EN 14774-1 (Solid biofuels - Determination of moisture content- Oven dry method).