Definition of fine-structure constant in English:

Share this entry

fine-structure constant


A fundamental and dimensionless physical constant, equal to approximately 1/137, which occurs in expressions describing the fine structure of atomic spectra.
Example sentences
  • Some of these constants, such as the fine-structure constant, are dimensionless and are not expressed in terms of units.
  • The researchers concluded that the fine-structure constant might well be constant, and that the variation seen in the prior work was highly unlikely.
  • Even atomic clocks can detect drifts in the fine-structure constant only over days or, at most, years.
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.