Explain how substances expand on the basis of vibrational motion of at

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

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

Answer»

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.