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The specific weight, also known as the unit weight, is the weight per unit volume of a material.
A commonly used value is the specific weight of water on Earth at 4 °C , which is 9.807 kilonewtons per cubic metre or 62.43 pounds-force per cubic foot.
Often a source of confusion is that the terms specific gravity, and less often specific weight, are also used for relative density. A common symbol for specific weight is γ, the Greek letter Gamma.
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