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:
1945–50

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American Heritage
Science Dictionary
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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Example sentences
Matter-Energy is the same after the reaction as before, so the conservation law is maintained.
The deflected ions provide thrust to the e-sail following the momentum conservation law.
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