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Re:2019 redefinition of the SI base units by droithomme on Monday July 01, 2019 @06:43PM (#20330451)
> Charge of an electron is a concrete fact

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.

Re:2019 redefinition of the SI base units by joshuamorton on Monday July 01, 2019 @07:56PM (#20330896)
> 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.

Are you suggesting the oil drop experiment was invalid?