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# Moisture Content

## Content of moisture in products like wood - wet and dry basis

Moisture content is the amount of water present in a moist sample of a product like wood, soil or similar. Moisture content  can be be expressed on wet or dry basis.

### Moisture Content on Dry Basis

Moisture content on dry basis is the mass of water to the mass of dry solid:

MCd = mh2o / md                                        (1)

where

MCd = moisture content on dry basis

mh2o = mass of water (kg, lb)

md = mass of dry solid (kg, lb)

Moisture content on dry basis is commonly used in the timber industry.

### Water Content on Wet Basis

Water content on wet basis is the mass of water to the mass of water and mass of solid:

MCw = mh2o / m

mh2omh2o + md                                   (2)

where

MCw = moisture content on wet basis

mh2o = mass of water (kg, lb)

mw = total mass of moist - or wet - sample - mass of solid and mass of water (kg,lb)

### Example - Water Content in Birch on Wet Basis

The density of air-dried seasoned dry Birch is 705 kg/m3 with 20% (0.2) water content. The amount of water per unit volume can be calculated by transforming (2) to

mh2omw MCw

= (705 kg/m3) (0.2)

= 141 kg/m3

The amount of solids can be calculated as

md = (705 kg/m3) (1 - 0.2)

= 564 kg/m3

### Example - Moisture Content in Birch on Dry Basis

The density of air-dried seasoned dry Birch is 705 kg/m3 with 20% (0.2) moisture content. Equation (1) can be modified to

MCd = mh2o / (m - mh2o)                                  (1b)

where

m = mass  water and solid (kg, lb)

This equation can be transformed to

mh2oMCd m / (1 + MCd )                  (1c)

The moisture content per unit volume can be calculated as

mh2o = (0.2) (705 kg/m3) / (1 + (0.2))

= 117.5 kg/m3

The amount of solids can be calculated as

md = m - mh2o

= (705 kg/m3) - (117.5 kg/m3)

= 587.5 kg/m3

### Moisture and Water Content Calculator

mass (kg, lb)

moisture/water content (%)

## Related Topics

• Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more

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