Penning mixture
Mixture of gases used in electric lighting / From Wikipedia, the free encyclopedia
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A Penning mixture, is a mixture of gases that is used in electric gas-discharge lamps. It is defined as a mixture of one inert gas with a minute amount of another gas, one that has lower ionization voltage than the main constituent. It is named after Frans Michel Penning.[1][2]
The well-known neon lighting and neon lamps and displays are filled not with pure neon, but with a Penning mixture.