The movement and vibration of molecules is heat.
So they move/vibrate, and then you point at it and say “look, heat”.
In other words, by definition.
If they all stopped moving, there would be no heat. And you wouldn’t be able to be there to observe it, because you being alive and performing observations alao by definition involves moving particles.
So you just have two definitions. One is that heat is moving particles. Second that if you’re thinking about it, there are moving particles enabling it, and therefore heat.
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