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This tag is for questions relating to collision which is the interaction between two or more bodies that results in physical contact and an exchange of momentum between the bodies involved. When it happens, kinetic energy is often exchanged between the molecules’ translational motion and their internal degrees of freedom.
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Definition of collision
When it comes down to it, a "collision" is just an interaction of the electron shells of the individual atoms of one, with the electron shells of the individual atoms of the other. … that because of "quantum" an' all that ... but the best you can say is that perhaps some of the electrons (and indeed atoms) migrate from one of the bodies to the other, and vice versa, during this "collision …