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  2. Wood - Wikipedia

    en.wikipedia.org/wiki/Wood

    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/cm 3 or g/ml). The terms are essentially equivalent as long as the metric system ...