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Interesting fact of the day. As you lift a rock into the air it actually **increases** its overall mass. Though the increase is so small you'd never notice it.
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@stunder Mass-energy equivalence. You are putting (potential) energy into the stone. That energy adds to the mass of the object.
Similarly if you charge a batter you arent adding anything Physical to the battery, it has all the same number of electrons, protons, and neutrons it did before just rearranged. Yet charging a battery would likely increase its mass every so slightly.
