Question

define density give its one application

Answer 1

density=mass/volume.....

Answer 2

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. ... Thus a relative density less than one means that the substance floats in water.
Application, use in floating ships and boats