When a substance becomes hotter or cooler or change in state due to external change in energy, few changes takes place like:
- Change in Interparticular force of attraction.
- Change in distance between voids.
When Energy is supplied:
A substance becomes more hot and changes it state i.e. Solid to liquid, or liquid to gas in normal conditions.
- External energy is supplied.
- Average kinetic energy increases.
- The particles gets excited.
- They start moving farther increasing their Interparticular force of attraction.
- They makes some changes in shape & volume.
When Energy is taken away:
A substance becomes colder and changes it state i.e. gas to liquid, or liquid to solid in normal conditions.
- Energy is taken away from the matter.
- Average kinetic energy decreases.
- The particles move closer to each other.
- The Interparticular force of attraction now increases because they are near to each other.
- This increases the density and make it compact.
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