Assertion: hardwood's density | /r/HasProperty | expressed in mass per unit substance
Facets:
Source sentences:
text: Specific gravity is the ratio of the mass of a substance to the mass of an equal volume of water; density is the ratio of a mass of a quantity of a substance to the volume of that quantity and is expressed in mass per unit substance, e.g., grams per milliliter (g/cm3 or g/ml).