The dimensional formula of relative density is:

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Accepted Answer

1. **Define Relative Density:** Relative density is defined as the ratio of the density of a substance to the density of a reference substance (usually water at $4^\circ	ext{C}$).
2. **Identify Dimensions:** Since it is the ratio of two identical physical quantities (density), their dimensions cancel each other out .
   $$	ext{Relative Density} = \frac{	ext{Density of substance}}{	ext{Density of water}} = \frac{[ML^{-3}]}{[ML^{-3}]} = [M^0L^0T^0]$$
3. **Conclusion:** Because the dimensional formula is $[M^0L^0T^0]$, relative density is a dimensionless quantity.

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