conservation-mass

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

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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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