Law of Conservation of Mass

The principle that matter can neither be created nor be destroyed. Matter can be changed from one form into another, substances can be chemically or physically decomposed, but the total amount of mass remains the same .

Citation: 
Adapted from "Law of Conservation of Mass." The American Heritage® Dictionary of Student Science, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved
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