Strong Nuclear Force is the strongest of all 4 fundamental forces. It is a fundamental interaction of nature that acts between subatomic particles of matter. The strong nuclear force holds most ordinary matter together because it confines quarks into hadron particles such as the proton and neutron. It also holds together the atomic nucleus and underlies interactions between all particles containing quarks.

The strong interaction is observable at two ranges

•          One is at about 1 to 3 fm, it is the force that binds protons and neutrons

•          Less than about 0.8 fm, it is the force that holds quarks together

As part of the standard model of particle physics, the strong force is described by quantum chromodynamics (QCD). Just as electric charge is the source of electromagnetism, or the electromagnetic force, so colour is the source of the strong force. This property has no connection with colour in the visual sense of the word.

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