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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

The nerve cells are a highly active mass of living material.

From A Practical Physiology by Blaisdell, Albert F.

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

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