The Boltzmann factor gives the ratio of the numbers of particles in energy states ε joules apart.
e-ε/kT
Even though it usually represents a tiny proportion, the particles collide many times every second, so the chances of gaining the needed activation energy increases.
This means that the reaction can happen in a matter of seconds.
The Boltzmann factor increases with temperature because the particles have a greater average energy, closer to the activation energy, meaning the reaction will happen faster.
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