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re: Why?
Johannes — (archived)

Alcaray said:
"I'd guess that motion of molecules is not too important (to the energy itself) in a chemical battery. Clearly the electrolyte must come in contact with the anode and cathode (I guess that implies motion?)."

What I understand about batteries is that the ions within the electrolyte move from the vicinity of the anode towards the cathode, the electrons move through the external circuitry from the cathode to the anode.
So there is movement within the system and that movement represents the energy content of the system, without that motion there would be no energy.

"What's your point?"

My point is that movement or motion is the fundamental requisite for any kind of energy.
We can talk about mechanical, electronic, chemical, nuclear, or photon energy and always the fundamental requirement is motion of some kind or another.
So the word energy refers to the movement of something even in Einstein's famous equation of E=MC squared.

Johannes

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