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 / v_{g }(1)
where
ρ = density (kg/m^{3})
m = mass (kg)
V = volume (m^{3})
v_{g} = specific volume (m^{3}/kg)
The SI units for density are kg/m^{3}. The imperial (BG) units are lb/ft^{3} (slugs/ft^{3}). 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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