Brownian Movements in Gases at Low Pressures

Abstract

The essential improvements which the "oil drop method" introduced into the study of Brownian movements consisted in 1. Enabling the observer to hold a given particle under observation as long as desired, even in a rarified gas, by counteracting the downward pull of gravity by the upward pull of an electrical field. 2. Eliminating completely all uncertainty as to the resistance offered by the medium to the motion of the drop through it.

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