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Mass-Energy Equivalence

The principle that mass and energy are equivalent and can be converted into each other, as described by Einstein's equation E = mc^2.

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Jan 12, 2026
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How big is the mass change from charging a typical smartphone battery in grams and scientific notation?

A fully charged smartphone battery gains an amount of mass so vanishingly small that it is undetectable in ordinary measurement: published community calculations and popular summaries put the increase...