mass defect

noun

Definition of mass defect

: the difference between the mass of an isotope and its mass number expressed in atomic mass units and being either positive or negative the mass defect of the carbon isotope6C12, mass 12.00388, is +0.00388, while that of phosphorus15P31, isotopic mass 30.984, is −0.016 — compare binding energy, packing fraction

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“Mass defect.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mass%20defect. Accessed 26 Nov. 2021.

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