Explain how substances expand on the basis of vibrational motion of atoms.

Monjur Alahi

Explain how substances expand on the basis of vibrational motion of atoms.


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Salim Ahmed Kawsar

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1. The atoms in a solid vibrate about their mean positions.

2. When heated, they vibrate faster and force each other to move a little farther apart. This results into expansion.

3. The molecules in a liquid or gas move with certain speed.

4. When heated, they move faster and force each other to move a little farther apart. This results in expansion of liquids and gases on heating.

5. The expansion is more in liquids than in solids; gases expand even more.

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