What happens to the air if its value is above its maximum dielectric field strength
Answers
Dielectric breakdown occurs when a charge buildup exceeds the electrical limit or dielectric strength of a material. The negatively charged electrons are pulled in one direction and the positively charged ions in the other. When electrons are removed from a nucleus, it becomes positively charged. When air molecules become ionized in a very high electric field, the air changes from an insulator to a conductor. Sparks occur because of the recombination of electrons and ions. Lightning occurs when there is a buildup of charge on the clouds and the ground It produces the electric field that exceeds the dielectric strength of air. Ionized air is a good conductor and provides a path where by charges can flow from clouds to ground.
The dielectric strength of air is approximately 3 kV/mm. Its exact value varies with the shape and size of the electrodes and increases with the pressure of the air.
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