Material density and water density have ratio {specific gravity}|. Specific gravity is one for water. Metals have higher specific gravities and sink in water. Wood has lower specific gravity and floats in water. Density D multiplied by gravity acceleration g is weight m*g per volume V {specific weight}: d*g = (m / V) * g = m*g / V.
Instruments {hydrometer}| can measure specific gravity.
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Date Modified: 2022.0225