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

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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

conservation of matter

principle that the mass of an object or collection of objects never changes, no matter how the constituent parts rearrange themselves. Mass has been viewed in physics in two compatible ways. On the one hand, it is seen as a measure of inertia, the opposition that free bodies offer to forces: trucks are harder to move and to stop than less massive cars. On the other hand, mass is seen as giving rise to gravitational force, which accounts for the weight of an object: trucks are heavier than cars. The two views of mass are generally considered equivalent. Thus, from the perspective of either inertial mass or gravitational mass, according to the principle of mass conservation, different measurements of the mass of an object taken under various circumstances should always be the same

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
His work helped develop the principle of conservation of matter.
Students will also investigate direct and indirect evidence as they explore
  atomic theory and conservation of matter.
Students should have experiences that contribute to the understanding of
  evaporation, condensation and the conservation of matter.
Conservation of matter is represented in balanced chemical equations.
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