The generation of electrical charges in contact or rubbing of solids has long been observed. This phenomenon may lead to hazardous effects such as ignition of explosive vapors, to problems in industrial processes such as fiber spinning or defects in photographic film production, or to personal discomfort of shocks obtained by discharge of body potential generated in contact of shoe soles with the ground. Useful processes such as electrostatic spraying or separation, or xerography, are also based on electrostatic charging effects.
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Meurig W. Williams (1976) studied this question.
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