Page 2 - Lesson Notes

 The expansion is due to the increased spaces between the particles.

 The particles in the solids vibrate more when it is heated and thus, resulting in

expansion.
 On cooling, the particles of a substance come back to their original state.

2. Application of Contraction and Expansion in Liquids:
 When the liquid is heated, the particles gain more energy and move rapidly or

vigorously.

 The movement overcome the forces of attraction between the particles, allowing
them to move freely, thus, increasing the volume.

 On cooling, the particles come back to their original positions.
3. Application of Contraction and Expansion in gases:

 Similarly, in the case of gases, on getting heated, they absorb a lot more energy,

and the inter-particle distances increase.
 At lower temperatures, the particles reduce their movement as they low energy

and the volume is decreased.

Some examples of Expansion and Contraction in our daily life:

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