atomic mass

noun

Definition of atomic mass

: the mass of an atom usually expressed in atomic mass units also : atomic weight

Examples of atomic mass in a Sentence

Recent Examples on the Web How changes in atomic mass leave clues to our climatological past. Dan Zak, Washington Post, 15 July 2019 Not only should the chemistry of the two isotopes be the same, the slight difference in atomic mass largely washes out in the watery environment of the body. Jennifer Ouellette, Quanta Magazine, 2 Nov. 2016 How changes in atomic mass leave clues to our climatological past. Dan Zak, Washington Post, 15 July 2019 Not only should the chemistry of the two isotopes be the same, the slight difference in atomic mass largely washes out in the watery environment of the body. Jennifer Ouellette, Quanta Magazine, 2 Nov. 2016 Say, for example, that all of the gases and particles collected indicate the fission products are 6.2 percent atoms with an atomic mass of 137, 6.1 percent with 99, and so on. Andrew Karam, Popular Mechanics, 7 Jan. 2016 Some have theorized that the soda got its name from the atomic mass of lithium, which is roughly seven. Beth Mole, Ars Technica, 22 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'atomic mass.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of atomic mass

1874, in the meaning defined above

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Time Traveler for atomic mass

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The first known use of atomic mass was in 1874

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Cite this Entry

“Atomic mass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/atomic%20mass. Accessed 14 Jun. 2021.

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More Definitions for atomic mass

atomic mass

noun

Medical Definition of atomic mass

: the mass of an atom usually expressed in atomic mass units also : atomic weight — compare mass number

More from Merriam-Webster on atomic mass

Britannica.com: Encyclopedia article about atomic mass

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