Question

Why do solids have high density than liquid and gas

Answer 1

Because density = mass/volume

and solids have less volume in more mass

therefore solids have high density

$....$

Answer 2

in solid state, the solid particles are very close to each other due to strong intermolecular force of attraction between them, therefore they have least intermolecular space that makes them denser compared to liquids and gases hence solid have high densities.

I hope this helps you !!!!!!