Is electrical conductivity of air affected by air temperature?

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Offline jaiii

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Hi.

Dos anybody know:

Is electrical conductivity of air affected by air temperature?
« Last Edit: 30/07/2013 16:02:51 by chris »

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Offline syhprum

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Re: electrical conductivity
« Reply #1 on: 29/07/2013 21:35:52 »
At modest temperatures the conductivity of air is virtually zero the only current that can pass  thru it is due to the small number of ions or electrons that enter it from space or radioactive sources.
At about 4000K the vibration of the air molecule's is sufficient to free the outer electrons and there is a rapid transition to a plasma state when the conductivity becomes very high such as in a carbon arc light.
syhprum

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Offline evan_au

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Re: electrical conductivity
« Reply #2 on: 30/07/2013 10:18:30 »
The dielectric strength of air is around 3 Million volts per meter, at room temperature.

Almost no current will flow until the voltage reaches these very high levels, such as in a lightning strike.
However, once the air is ionised, the spark/plasma will continue conducting as long as the current is sustained.