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Density, Specific Weight and Specific Gravity

Density is defined as an objects mass per unit volume. Mass is a property.

The density can be expressed as

ρ = m / V = 1 / vg (1)


ρ = density (kg/m3)

m = mass (kg)

V = volume (m3)

vg = specific volume (m3/kg)

The SI units for density are kg/m3. The imperial (BG) units are lb/ft3 (slugs/ft3). While people often use pounds per cubic foot as a measure of density in the U.S., pounds are really a measure of force, not mass. Slugs are the correct measure of mass. You can multiply slugs by 32.2 for a rough value in pounds.

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