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This energy makes the particles in a gas or a liquid move around faster.
In a solid, the particles vibrate more rapidly.
This means it can't go lower than zero, because there's a limit to how slow particles can move.
The unit of heat energy is the joule (J)
but there are other temperature scales, like °F (degrees Farenheit)
Energy tends to flow from hot objects to cooler ones
e.g. warm radiators heat the cold air in your room