Shouldn't the mass of an electron be uncertain?

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    Electron Mass
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SUMMARY

The mass of an electron is known with extraordinary precision, quantified to 31 orders of magnitude. This precision arises from advanced measurement techniques that account for uncertainties in the mass value. While the mass itself is defined as approximately 9.109 x 10^{-31} kg, the significant digits preceding the exponent are subject to uncertainty. This discussion highlights the distinction between the certainty of the exponent and the variability of the coefficient in scientific measurements.

PREREQUISITES
  • Understanding of fundamental physics concepts, particularly quantum mechanics.
  • Familiarity with scientific measurement techniques and precision.
  • Knowledge of the significance of significant figures in scientific notation.
  • Basic grasp of particle physics and the Standard Model.
NEXT STEPS
  • Research the methods used in precision measurements of fundamental particles.
  • Explore the implications of quantum uncertainty on particle mass measurements.
  • Learn about the role of significant figures in scientific reporting.
  • Investigate the Standard Model of particle physics and its components.
USEFUL FOR

Physicists, students of quantum mechanics, and researchers in particle physics will benefit from this discussion, particularly those interested in the precision of fundamental constants.

gamow99
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How is the mass of an electron known down to 31 orders of magnitude? Shouldn't the mass be uncertain beyond a few decimal places?
 
Physics news on Phys.org
It is, the [itex]10^{-31}[/itex] is certain, the 9 something number at the front isn't.
 

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