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conservation law

noun, Physics, Chemistry.
any law stating that some quantity or property remains constant during and after an interaction or process, as conservation of charge or conservation of linear momentum.
Origin of conservation law
1945-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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conservation-law in Science
conservation law  
Any of various principles, such as the conservation of charge and the conservation of energy, that require some measurable property of a closed system to remain constant as the system changes. Conservation laws can be directly related to principles of symmetry. See also invariance, Noether's theorem.

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