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law of conservation of mass

noun, Physics.

conservation of mass

noun, Physics.
the principle that in any closed system subjected to no external forces, the mass is constant irrespective of its changes in form; the principle that matter cannot be created or destroyed.
Also called law of conservation of mass, conservation of matter.
Origin of conservation of mass
1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for law-of-conservation-of-mass

conservation of mass

the principle that the total mass of any isolated system is constant and is independent of any chemical and physical changes taking place within the system
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
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law-of-conservation-of-mass in Science
conservation of mass  
A principle of classical physics stating that the total mass of a closed system is unchanged by interaction of its parts. The principle does not hold under Special Relativity, since mass and energy can be converted into one another.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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