When applying heat the solid will eventually reach its melting point. Its then that the solid will slowly start to turn into a liquid due to the heat transfer. The process will only continue with even more heat piling up causing it to evaporate and become a gas.
Heat transfer comes in different ways depending on the solid:
either-
| | |
conduction
convection
or
radiation
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this is all I know for now.
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Lucky me! We actually learned this in class today
I hope I helped in some way! :)