How do things become hot or cold?
In: Physics
It’s a matter of energy.
Energy cannot be created or destroyed, you can just transform it.
So let’s say you have a piece of metal and start hammering it. After a while you will notice that the metal is hotter even if it was at room temperature, the same for the hammer. This happens because you put kinetic energy in your blow and the metal cannot absorb it all, so the excess transform in heat.
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