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.

For editors and proofreaders

Line breaks: fine-structure con|stant

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.