Question

why does a solid change into a liquid when heat is added

Answer 1

Answer:

When a solid is heated, the particles are given more energy and start to vibrate faster. At a certain temperature, the particles vibrate so much that their ordered structure breaks down. At this point the solid melts into liquid.

Answer 2

Answer:

the heat breaks up the inter molecular forces holding the atoms or molecules in the solid together changing it to weaker state called as liquid

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