Townsend discharge

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In electromagnetism, the Townsend discharge or Townsend avalanche is an ionisation process for gases where free electrons are accelerated by an electric field, collide with gas molecules, and consequently free additional electrons. Those electrons are in turn accelerated and free additional electrons.

Excerpt from the Wikipedia article “Townsend discharge”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dougsim, CC BY-SA 3.0, via Wikimedia Commons.