active mass

active mass

noun Chemistry.
the effective concentration of a substance.

Origin:
1905–10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Active mass is always a great word to know.
So is yield. Does it mean:
the quantity of product formed by the interaction of two or more substances, generally expressed as a percentage
a highly concentrated, aqueous solution of potassium hydroxide or sodium hydroxide, or any solution resulting from leaching or percolation
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