Specific gravity is defined as the ratio of

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Specific gravity is defined as the ratio of

1. density of the substance to the density of water
2. density of the substance to the density of water at 0°C
3. density of water at 4°C to the density of the substance
4. density of the substance to the density of water at 4°C

Correct Option: A

Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.