Question

4. Define relative density of a substance. Does it have any units? If the relative density of a substance is less than unity, will the substance sink in or float on water?​

Answer 1

Answer:

==>If a substance's relative density is less than 1 then it is less dense than the reference; if greater than 1 then it is denser than the reference. If the relative density is exactly 1 then the densities are equal; that is, equal volumes of the two substances have the same mass.

Explanation:

==>Relative density is the ratio of density of a substance to the density of water at 40 C .Since the units for both the numerator and denominator are same, they cancel each other. Thus relative density has no units. Density is defined as mass per unit volume. Hence its SI unit is: kg/m3.

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Answer 2

Answer:

The relative density means density of any substance divided by density of other substance taken as reference.

It does not have any unit it is dimension less quantity.

if the density of any substance is less than unity than the substance will float on water because it will have less density than water and less density means no sinking