The townsend (symbol Td) is a physical unit of the reduced electric field (ratio E/N), where E {\displaystyle E} is electric field and N {\displaystyle N} is concentration of neutral particles. It is named after John Sealy Townsend, who conducted early research into gas ionisation.
The townsend (symbol Td) is a physical unit of the reduced electric field (ratio E/N), where E {\displaystyle E} is electric field and N {\displaystyle N} is concentration of neutral particles. It is named after John Sealy Townsend, who conducted early research into gas ionisation.
Source: Wikipedia "Townsend (unit)" · CC BY-SA 4.0
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