Twenty Thousand Miles a Second

7月 2, 2010 · Posted in 未分類 

Man’s ideas have changed markedly since the days when he thought the gods hurled lightning like spears and caused thunder by driving their metal chariots across the sky. Today, lightning has been reduced to a mere electrical unbalance, resulting when a preponderance of positive electrical charges accumulate at one place while a preponderance of negative charges accumulate somewhere else. This happens with the formation of thunderclouds, when strong upward air currents carry positive charges to the top of the cloud, while negative charges accumulate in the lower regions of the cloud.

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