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amount of substance

British

noun

a measure of the number of entities (atoms, molecules, ions, electrons, etc) present in a substance, expressed in moles

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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.

“Ultimately, this will end up depending upon the amount of substance behind the investigation and whether there is anything there at the end of the day.”

From The Wall Street Journal • Jan. 13, 2026

The amount of substance produced by this method will remain limited to thin film technology applications for some time to come.

From Science Daily • Nov. 3, 2023

“There is a vast amount of substance in the relationship,” he added.

From New York Times • Feb. 17, 2022

Being extensive properties, both mass and volume are directly proportional to the amount of substance under study.

From Textbooks • Feb. 14, 2019

An amount of substance from the sun would have more attracting power than the same amount from the earth, because the sun has more electrical power.

From The Universe a Vast Electric Organism by Warder, George Woodward

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023