law conservation mass

law of conservation of mass

noun Physics.
Dictionary.com Unabridged

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:
1880–85

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
conservation of mass
 
n
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 10th Edition
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American Heritage
Science Dictionary
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.
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