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Balloon Flight and Atmospheric Electricity

Emilio Herrera

出版	National Advisory Committee for Aeronautics, 1924
URL	http://books.google.com.hk/books?id=cpD2ZwEACAAJ&hl=&source=gbs_api

註釋

The air is known to be charged with electricity (chiefly positive) with reference to the earth, so that its potential increases with the altitude and the difference in potential between two points in the same vertical line, divided by the distance between them, gives a value called the "potential gradient," which may vary greatly with the altitude, the nature of the ground and the atmospheric conditions.