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In this video I explain what physicists mean by "energy", how it is defined, why it is always conserved, what the difference is between "energy" and "free energy", why actually energy is not always conserved, and why this still makes sense.

#physics #science #education

0:00 Intro
0:45 Basic Properties of Energy
1:55 Mathematical Definition
4:02 Free Energy and Heat
6:39 Energy in General Relativity
8:46 Summary
9:04 Sponsor Message