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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

The team was able to determine that the r-process can produce atoms with an atomic mass of at least 260 before they fission.

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

The protein and synthetic polymer molecules that form colloids may have molecular masses ranging from a few thousand to many million atomic mass units.

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