Research topic:thunderstorm

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thunderstorm

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

thunderstorm Electrical storm caused by the separation of electrical charges in clouds. Water drops are carried by updraughts to the top of a cloud, where they become ionized and accumulate into positive charges – the base of the cloud being negatively charged. An electrical discharge (a spark) between clouds, or between a cloud and the ground, is accompanied by light (seen as a lightning stroke) and heat. The heat expands the air explosively and causes it to reverberate and produce sounds and echoes called thunder.

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