What is the SI unit of specific gravity

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JKSSB JE Civil Jal Shakti 6 Dec 2022 Official Paper (Shift 2)
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  1. Kg/m3
  2. kN/m3
  3. m3/kg
  4. No units

Answer (Detailed Solution Below)

Option 4 : No units
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Explanation:

  • Specific gravity: It is also known as relative density, it is the ratio between the density of an object and a reference substance.
    • The specific gravity can tell us, based on its value, if the object will sink or float in our reference substance.
    • Mathematically it is Specific gravity = Density of substance/density of water.
    • It has no dimension.
    • Usually, our reference substance is water which always has a density of 1 gram per milliliter or 1 gram per cubic centimeter or 1000 kg /m3.
  • From the above, it is clear that specific gravity has no dimension. Therefore option 4 is correct.

Additional Information

  • Density: It is defined as the mass of a body per unit volume. We can also say how much mass it can contain in a specific volume.
    • As of dense material like Iron takes more mass in a given volume than of wood.
    • Mathematically it gives a formula Density (ρ) = mass (m) / Volume (V)
    • SI Unit is kg/m3.
    • 1m3 = 1000 liters of water.
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