The volume of any liquid completely filled in a relative density bottle remains the same.

The density of a substance is the ratio of its density to the density of water at $4{ }^{\mathrm{o}}\mathrm{C}$.

On multiplying the relative density by $1000$, one gets the density of a substance in $\mathrm{kg} {\mathrm{m}}^{-3}$.

A body of density $3.5 \mathrm{g}/{\mathrm{cm}}^3$ will float on water.

A land breeze arises due to the differential heating between land and water surfaces.