Question

(i) Why do solids have an open surface but gases do not? Explain.​

Answer 1

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The particles of solids are very close to each other and force of attraction between the particles is very strong.Therefore, solids have a definite compact structure and an open surface. While the particles of gases are very far away from each other and have least force of attraction between them. Therefore, gases do not have definite shape, they diffuse easily into air and hence have no open surface area.

Answer 2

because the solid has a fixed shape because it is adjacent and regular. In addition solids molecules cannot move freely because each other has a very strong force .

while the gas have variable shapes and volume because gas molecules can move freely .

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