In particle physics, the strong interaction (also called the strong force, strong nuclear force, or colour force) is one of the four fundamental interactions of nature, along with electromagnetic force, weak interaction (weak force) and gravitation. It is a non-contact force described as strong since, for interactions involving sufficiently low energies, the strong interaction is the "strongest" of the four fundamental forces; its strength is 100 times that of the electromagnetic force, and several orders of magnitude greater than that of the weak force and gravitation. (These ratios are in fact figures of convenience; the fundamental figures vary dramatically according to the distances over which the forces are exerted. For example, the "weak" force really is roughly as strong as the electromagnetic force at the distances relevant to its effects, which are a small fraction of the radius of the nucleus of an atom.)
The strong interaction is observable in two areas: On the larger scale, it is the force that binds protons and neutrons together to form the nucleus of an atom. On the smaller scale, it is also the force that holds quarks and gluons together to form the proton, the neutron and other particles.
In the context of binding protons and neutrons (nucleons) together to form atoms, the strong interaction is called the nuclear force (or residual strong force). In this case, it is the residuum of the strong interaction between the quarks that make up the protons and neutrons. As such, the residual strong interaction obeys a quite different distance-dependent behavior between nucleons, than when it is acting to bind quarks within nucleons.
The strong force is thought to be mediated by gluons, acting upon quarks, antiquarks, and the gluons themselves. This is detailed in the theory of quantum chromodynamics (QCD). [Wikipedia]
The Gluon is presumed to be the smallest unit of syntropy or attractive force. [See Syntropy, Assimilation, Attraction, Centripetal, Affinity, Subdivision, Bjerknes Effect, Etheric Elements, Law of Attraction]
"We shall again have to refer to Cavendish's investigations, and need only state that his experiments proved conclusively, and in the best possible manner as far as the instruments at his disposal would allow, that the attraction or repulsion between two small charged bodies varies directly as the product of their charges, and inversely as the square of the distance between them, so that the law of electrical action is the same as Newton's law of gravitation, except that the stress between similarly charged bodies is repulsive, and that between dissimilarly charged bodies attractive." (from Maxwell bio, page 262), [see 14.35.1 - Keely 3 6 and 9]
14.35.1 - Keely 3 6 and 9
Sympathetic Negative Attraction