Question

Why do solids have definite shape but liquids do not?

Answer 1

When kinetic energy is low intermolecular forces are strong the matter has definite shape. When the kinetic energy is appreciable the intermolecular forces are same but the molecules lie within the range of these forces. hence the molecules are not able to create definite shaped lattice. They flow like liquids.

Answer 2

Solids have a definite shape and volume. 

Solids are used where we need something to keep it's shape or to support something.
This is because they have a fixed shape and remain in the same place where they are kept. They generally can't be compressed. This doesn't happen in liquids.

Solids are usually hard since their particles are closely packed together. Closer the particle , harder is the substance. This is not in liquids.

Particles of a solid cannot move much. This is one of it's physical characteristic. As the intermolecular space is very less , they have a solid shape.Liquids dont have.

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