class 6 CBSE
science chapter 6
changes around us
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Yes all changes involve interactions.
No, we cannot mean only physical interaction here. It may also be non-physical interactions. Let us give some examples having non-physical interactions.
Conversion of water to vapour by evaporation: Here, water molecules attain kinetic energy due to the surrounding heat, thus they interact with each other and evaporate to vapour.
Chemical reaction between iron and sulphur on heating: By heating, the atoms present in the mixture of iron and sulphur attains energy, interact with each other and form iron sulphide.
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