If the densities of two substances are equal, then what is the relative density of one substance with respect to another?

• Relative density is defined as the ratio of a density of a substance to the density of given reference material.
  $\mathrm{Relative} \mathrm{density}= \frac{\mathrm{Density} \mathrm{of} \mathrm{the} \mathrm{substance}}{\mathrm{Density} \mathrm{of} \mathrm{reference} \mathrm{material}}$
• We have been given,
  Density of the substance = Density of the reference material
• $\mathrm{Relative} \mathrm{density} \mathrm{of} \mathrm{the} \mathrm{substance} \mathrm{with} \mathrm{respect} \mathrm{to} \mathrm{reference} \mathrm{material}= \frac{\mathrm{d}}{\mathrm{d}}= 1$     

Therefore, the relative density will be equal to 1.