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The Townsend (symbol Td) is a physical unit of E / N, where E is electric field and N is concentration of neutral particles. It is defined by the relation .
Additional recommended knowledge
This unit is important in gas discharge physics, because the mean energy of electrons (and therefore many other properties of discharge) is a function of E / N. It means that increasing the electric intensity E by some factor q has the same consequences as lowering gas density N by factor q.
It is named after John Sealy Townsend (see other articles in this stub).
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Townsend_(unit)". A list of authors is available in Wikipedia.|