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 Wet Basis
Moisture content on wet basis is the mass of water to the mass of water and mass of solid:
MCw = mh2o / mw
= mh2o / mh2o + 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 - Moisture Content in Birch
The density of air-dried seasoned dry Birch is 705 kg/m3 with 20% (0.2) moisture content. The amount of water can be calculated as
mh2o = (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
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