Heat of the Moment

Either my radiator is broken, or someone really hot just walked in.


Thermodynamics

In general, thermodynamics takes a look at the effects of work, heat, and energy on a system.
The First Law of Thermodynamics states that energy cannot be created or destroyed, but it is converted from one form of energy to another. This means that something like heat cannot be created or destroyed and instead it transferred from one object to another.

 

Heat 

Heat is often associated with things being hot, but heat in physics is just the transfer of energy between two objects because of their temperature difference.

The way that energy is transferred is from hot to cold. The molecules in a hot object are moving a lot faster than the molecules in the cold object, and so the fast moving molecules interact and collide with the slower molecules, transferring energy to them. This means that the hotter object (with faster moving molecules) is losing energy to the cooler object.



Heat
                  flows from hot to cold
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