The temperature at which specific gravity is calculated must be mentioned because:

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the mass of the substance changes with temperature

The density of a substance varies with temperature.

The substance's rigidity varies with temperature.

None of the preceding

answer is B.

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Detailed Solution

Specific gravity changes with temperature and pressure; therefore, the reference and sample must be compared at the same temperature and pressure or corrected to a standard reference temperature and pressure. In water, substances with a specific gravity of one are neutrally buoyant.

Because the volume of the substance changes with temperature, which means the density of the substance changes with temperature, the temperature at which specific gravity is calculated must be specified.

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