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Never. The specific gravity of a substance is its density compared to water.

If that happens to be 2.509, then any amount of the substance weighs

2.509 times as much as an equal amount of water. One cubic foot of water

weighs about 62.4 pounds, so one cubic foot of the substance you've described

weighs about 156.6 pounds.

"50 pounds per cubic foot" means that the specific gravity is about 0.80 .

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Q: When does a specific gravity of 2.509 equal a density of 50 pounds per cubic foot?
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