Question

why is solid denser as compared to liquid and gasses

Answer 1

Explanation:

because the solid contains particles which are closely packed and liquid and gases substances contain particles which are loosely packed

Answer 2

The atoms or molecules in a solid have fixed positions; they don't move around like atoms or molecules in a gas or liquid do. That's why liquids and gases can flow, but solids don't. Solids are usually much more dense than liquids and gases, but not always.