Why does the strong nuclear force act only over tiny distances?
Quick Answer
The strong force is mediated by particles called gluons, but its effective reach is limited inside and between nucleons. Beyond about a femtometer, the force drops off very rapidly.
The Full Story
The strong interaction binds quarks together inside protons and neutrons, and a residual version holds nuclei together. Unlike gravity or electromagnetism, it does not spread over large distances in a simple way because quarks and gluons are confined. The force becomes extremely powerful when quarks are pulled apart, but the leftover nuclear force between protons and neutrons is short-ranged. This short range is why atomic nuclei are compact and why only nearby nucleons contribute to nuclear binding. It is a central feature of quantum chromodynamics, the theory of the strong force.
Key Facts
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"Why is the universe’s strongest force so short-range?"
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