molecular mass

noun

: the mass of a molecule that is equal to the sum of the masses of all the atoms contained in the molecule

Examples of molecular mass in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The molecular mass of nitrogen is greater than water, which means the less dense water replaces denser nitrogen in moist air. Marshall Shepherd, Forbes, 25 Mar. 2025 While Delta 8 and Delta 9 THC share a very similar chemical structure, there is one major difference: The molecular mass. Amber Smith, Discover Magazine, 19 Oct. 2022

Word History

First Known Use

1873, in the meaning defined above

Time Traveler
The first known use of molecular mass was in 1873

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Cite this Entry

“Molecular mass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/molecular%20mass. Accessed 15 Apr. 2025.

Kids Definition

molecular mass

noun
: the mass of a molecule that is equal to the sum of the masses of all the atoms contained in the molecule's formula
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