fine-structure constant

noun

Definition of fine-structure constant

: a dimensionless constant that is a measure of the strength of electromagnetic interactions of subatomic particles and that has an approximate value of 0.0073 or ¹/₁₃₇ symbol α

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“Fine-structure constant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fine-structure%20constant. Accessed 27 Feb. 2020.

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