Question

1) Why solids cannot flow?
2)Why liquids can be compressed?

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Answer 1

Why solids cannot flow?

They are held tightly together by strong forces of attraction. They are held in fixed positions but they do vibrate. Because the particles don't move, solids have a definite shape and volume, and can't flow. Because the particles are already packed closely together, solids can't easily be compressed.

Why liquids can be compressed?

Because the particles can move, liquids don't have a definite shape, and they can flow. Because the particles are still packed close together, liquids can't easily be compressed and keep the same volume.

Answer 2

Answer:

Solids are held in fixed positions, they can only vibrate. Because the particles can not move, solids have a definite shape and volume, and can't flow. Because the particles are already packed closely together, solids can't easily be compressed.

Liquids and gases have intermolecular space; on giving external pressure on them the molecules can come together thereby reducing the space between them. But in case of solids there is no intermolecular space to do so