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Gravitation — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceGravitation3 Marks
Question
What is the difference between the density and relative density of a substance?
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Answer

  • Density: The density of a substance is defined as mass of the substance per unit volume.
Density of substance $=\frac{\text{mass or substance}}{\text{volume of substance}}$

SI unit of density is $kg/m^3$.
  • Relative density: The relative density of a substance is the ratio of its density to that of water.
Relative Density of substance $=\frac{\text{Density of substance}}{\text{Density of water}}$

It has no unit

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