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Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding [tag:energy-conservation] if it is specifically about its conservation.

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We only can speak about the energy density in a container if its energy content is independent from its dimension -so could, in principle, have any value at all. If in Einstein’s statement “People … ’ with ‘energy,’ then the energy content of the universe is not independent from its volume. Doesn’t this mean that we cannot then speak about the energy density of the universe as a whole? …
asked Apr 30 '18 by Anton
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General relativity is said to be background independent. Can we nevertheless think of a completely empty space (devoid of any energy) as if it is furnished with an elastic three-dimensional fabric, a … cubic grid the cubes of which have the same size everywhere as long as it remains empty and that it is the insertion of matter, of localizable energy which distorts this fabric locally, which causes …
asked May 2 '18 by Anton