Discussion
The electric field required for breakdown in dry air at sea level is approximately
Answer: A
Correct answer: 3 million volts per metre
The breakdown strength of dry air at sea level is about 3 MV per metre. Fields within thunderclouds rarely exceed a tenth of that, partly because the air is less dense at altitude and partly because breakdown begins locally at hydrometeors and on sharp points long before the average field reaches the nominal value. How lightning is initiated at these lower fields remains an open question, with runaway breakdown one proposed answer.
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