Discussion
A liquid has a specific gravity of 0.8. What is its density in kilograms per cubic metre?
Answer: B
Correct answer: 800
Specific gravity is a ratio to the density of water, which is 1000 kg per cubic metre, so \[ 0.8 \times 1000 = 800\ \mathrm{kg/m^3}. \] It is dimensionless by construction, and the 0.8 offered is the specific gravity itself rather than a density - a substitution that would leave any subsequent calculation wrong by a factor of a thousand.
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