The quantisation of charge was first suggested by the experimental laws of electrolysis discovered by Faraday

I think about it a lot but could not find any relation, as the number of electrons involved is too large in electrolysis that the charge can be assumed to be continuous and discrete nature is negligible.

How did Faraday first suggested quantisation by this non microscopic process (electrolysis)?

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    $\begingroup$ Did you read en.wikipedia.org/wiki/Faraday%27s_laws_of_electrolysis? It's the number of chemical valence electrons that is discrete, which is different for different metals. Some go into (or come out of) solution using one electron, others need two or three. $\endgroup$ – CuriousOne Apr 18 '16 at 2:04
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    $\begingroup$ @CuriousOne so discrete nature of valence electrons suggested quantisation of charge? $\endgroup$ – user26831 Apr 18 '16 at 2:09
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    $\begingroup$ Yes. You are correct that one can't measure a single electron that way, but it's easy to distinguish 1 mole of electrons from 2 mole of electrons. $\endgroup$ – CuriousOne Apr 18 '16 at 2:11

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