conservation law(redirected from Law of the Conservation of Momentum)
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Any of various principles, such as the conservation of charge and the conservation of energy, directly related to principles of symmetry and requiring some measurable property of a closed system to remain constant as the system changes.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
any physical law stating that a quantity or property remains constant during and after an interaction or process.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.