What do a.m. and p.m. stand for?

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 of conservation of mass
1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for conservation of matter
  • 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.
  • Balance simple chemical equations applying the conservation of matter.
British Dictionary definitions for conservation of matter

conservation of mass

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
conservation of matter in Science
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.
Cite This Source

Word of the Day

Difficulty index for conservation of mass

Few English speakers likely know this word

Word Value for conservation

Scrabble Words With Friends