conserva'tion of mass'

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, conserva'tion of mat'ter.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

conservation of linear momentumconservatism
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