Austrian physicist Victor Hess settled the issue in 1912, when he went aloft in a balloon and showed that the higher he rose, the faster the charge leaked off his electroscope.

• 奥地利物理学家海斯（VictorHess）于1912年解决了这个问题：他搭乘气球升高，证明飞得越高，验电器流失电荷的速度便越快。