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Quantum electrodynamics

1 article · Physics · Wikipedia

Quantum electrodynamics, or QED, is the branch of physics that explains how light and charged particles like electrons interact with each other using the rules of quantum mechanics. It describes electromagnetic forces at the smallest scales—where atoms and subatomic particles live—and shows that light is made of tiny packets of energy called photons that can be created and destroyed in interactions with matter. QED is one of the most precisely tested theories in science, making predictions so accurate that they've been confirmed to better than one part in a billion.

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