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The Entropy of a Black Hole Is Proportional to Its Surface Area
The entropy of something is proportional to its area, not its volume. We absolutely have very ordinary, non-gravitational, non-black hole examples of that. That's surprising because if you take our condensed matter system, remember I said it was in its lowest energy state,. Its lowest energy state is not its maximum entropy state. You can't fit more entropy into any region of space than a black hole has.