In gas at atmospheric pressure, a free electron collides with gas atoms so infrequently that it only travels long enough to gain the speed required to ionize an atom by collision.

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In gas at atmospheric pressure, a free electron collides with gas atoms very frequently, not infrequently. This high collision rate prevents the electron from gaining enough energy between collisions to ionize an atom through collision, under normal conditions.

In Gas at Atmospheric Pressure, a Free Electron Collides with Gas