CBSE Notes for Class 9 Science chapter 1. Matter in Our Surroundings in english Medium
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1. Matter in Our Surroundings
Phenomenon of changing of a liquid into vapours at any temperature below its boiling point is called evaporation.
- Particles of matter are always moving and are never at rest.
- At a given temperature in any gas, liquid or solid, there are particles with different amounts of kinetic energy.