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Definitions

atomic mass

[uh-tom-ik mas] / əˈtɒm ɪk ˈmæs /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Potassium occurs naturally in three isotopic forms -- potassium-39, potassium-40, and potassium-41 -- each differing slightly in atomic mass.

From Science Daily • Oct. 17, 2025

When we refer to light or heavy elements, we're talking about their atomic mass.

From Science Daily • Dec. 7, 2023

Twelve, named for the atomic mass of carbon, has developed a process to make jet fuel using renewable electricity, water and waste biomass CO2 instead of fossil fuels.

From Seattle Times • Jul. 12, 2023

When a naturally occurring element is composed of several isotopes, the atomic mass of the element represents the average of the masses of the isotopes involved.

From Textbooks • Feb. 14, 2019

The best evidence that these particles are of atomic mass is furnished by their deflection in electric and magnetic fields.

From A Brief Account of Radio-activity by Venable, Francis Preston