Question

when heat is being supplied,then what does the heat energy do to the particles of solid?

Answer 1

This makes the otherwise, very stationary molecules to start vibrating. As more and more heat is given to a solid object, the molecules faster and more vigorously and if they absorb enough heat, the bonds between molecules becomes less and less, eventually resulting in solids, melting.

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Answer 2

They start vibrating and as the heat goes up (according to the substance heat holding capability)the substance start boiling melting etc