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active mass

American  

noun

Chemistry.
  1. the effective concentration of a substance.


Etymology

Origin of active mass

First recorded in 1905–10

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.

Pita has maintained iTV was not an active mass media organisation.

From Reuters • Jul. 12, 2023

At week's end active mass resistance appeared to have been suppressed.

From Time Magazine Archive

Again, there was an intensely active mass of weaving bright stripes and loops and circles, seeming to consist of light only, and making them dizzy in a few seconds.

From The Einstein See-Saw by Breuer, Miles John

As you have said, you are using only a minute portion of the active mass of your brain.

From Skylark Three by Wessolowski, Hans Waldemar

Guldberg and Waage expressed this in the form “the active mass of a solid substance is constant.”

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" by Various