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| a particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron's negative charge |
| the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum |
| strong interaction or strong force | |
| —n | |
| physics See interaction strong nuclear interaction, Also called: strong nuclear force an interaction between elementary particles responsible for the forces between nucleons in the nucleus. It operates at distances less than about 10--15 metres, and is about a hundred times more powerful than the electromagnetic interaction | |
| strong force or strong force | |
| —n | |
| strong interaction
See strong nuclear force. |