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All matters in the universe exist in three states namely solid, liquid and gas.

(a) Why do solid substances have definite shape?
(b) Write any two properties of a solid substance.
(c) Will the solid substance expand on heating? Why?


Solid have a correct shape because its particles are held tightly at a certain position by the attractive forces.

1. it has its own particular mass, 2. Its volum is fixed and does not change.

Yes, because the hotter a substance more its atoms move voilenty, so it takes more space than it needed previously. So the substance expand.
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Atoms in a solid substance are closly packed

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