every single measurement is subject to measurement uncertainty. the mass of an electron will be quoted with some errorbar.
we had a quote in the lab at uni: errorbars or it didn't happen. errorbars aren't a weakness, on the contrary, they indicate how confident we are of some measurement.
we had a quote in the lab at uni: errorbars or it didn't happen. errorbars aren't a weakness, on the contrary, they indicate how confident we are of some measurement.