Multiple choice

The value of which one of the following quantities remains same in all systems of units?

  1. Specific gravity

  2. Acceleration due to gravity

  3. Density

  4. None of these

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A Correct answer
Explanation

Specific gravity is the ratio of the density of a substance to the density of a reference substance (usually water for liquids). Since it is a ratio of two quantities with the same units, the units cancel out, making it a dimensionless quantity with the same numerical value in all unit systems.

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