Common
Specific weight
Weight per unit volume of a material
Specific weight
The specific weight, also known as the unit weight (symbol γ, the Greek letter gamma), is a volume-specific quantity defined as the weight W divided by the volume V of a material: γ = W V . {\displaystyle \gamma ={\frac {W}{V}}\ .} Equivalently, it may also be formulated as the product of density, ρ, and gravity acceleration, g: γ = ρ g . {\displaystyle \gamma =\rho \,g.} Its unit of measurement in the International System of Units (SI) is the newton per cubic metre (N/m3), expressed in terms of base units as kg⋅m−2⋅s−2. A commonly used value is the specific weight of water on Earth at 4 °C (39 °F), which is 9.807 kilonewtons per cubic metre or 62.43 pounds-force per cubic foot.
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