Hence the specific gravity of a piece of wood with a density of 35 pounds is 35 / 62.43 = 0.561.To find the weight per cubic foot when the specific gravity is given, simply multiply by 62.43.Thus, 0.561 X 62.43 = 35.

In the metric system, since the weight of a cubic centimetre of pure water is one gram, the density in grams per cubic centimetre has the same numerical value as the specific gravity.
Since the amount of water in wood is extremely variable it usually is not satisfactory to refer to the density of green wood.

For scientific purposes the density of "oven-dry" wood is used; that is, the wood is dried in an oven at a temperature of 100 deg.C.

(212 deg.F.) until a constant weight is attained.

For commercial purposes the weight or density of air-dry or "shipping-dry" wood is used.