Comment on 2019 redefinition of the SI base unitsparentComments−droithomme7yCharge of an electron is a concrete factIt's only a fact in one's imagination, as concrete as a fact about properties of any other thing that can only be measured indirectly.We have no way to directly measure the charge of one electron, so it's a fanciful claim, or at best an approximation, and not a concrete fact.Claims about wires can be verified.−joshuamorton7yWe have no way to directly measure the charge of one electron, so it's a fanciful claim, or at best an approximation, and not a concrete fact.Are you suggesting the oil drop experiment was invalid?
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It's only a fact in one's imagination, as concrete as a fact about properties of any other thing that can only be measured indirectly.
We have no way to directly measure the charge of one electron, so it's a fanciful claim, or at best an approximation, and not a concrete fact.
Claims about wires can be verified.
Are you suggesting the oil drop experiment was invalid?