To be effective, collisions between atoms must occur with the proper orientation and also the proper amount of energy.
An inelastic collision is a collision in which there is a loss of kinetic energy. While the momentum of the system is conserved in an inelastic collision, the kinetic energy is not. This is because some kinetic energy has been transferred to something else.
In this case, is necessary have energy to be effective, so collisions between atoms must occur with the proper orientation.
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