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# The Real Meaning of E=mc²
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## [The Real Meaning of E=mc²](https://www.youtube.com/watch?v=Xo232kyTsO0)
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## What is the meaning of $E=m c^2_{sound}$ for the sound?
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- perhaps, there is a meaning of mass, which is not total mass but partial sound-susceptibility related mass?
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# Parents
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* Electron-to-proton mass ratio⏎
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