Question

gases have lower density as compared to liquid's and solids

Answer 1

Gases have lower density as compared to liqids and solid because the intermolecular force of attraction between the gas particles is very less so they move far away from each other

Answer 2

Density:-The molecules of a liquid are packed relatively close together. Consequently liquids are much denser than gases. ... Because of their higher kinetic energy compared to the molecules in a solid, however, the molecules in a liquid move rapidly with respect to one another.