Atoms and molecules are the building blocks of matter. Freezing water (or turning it into steam) changes the way the molecules are arranged, but it doesn't change the molecules themselves. It doesn't change their total weight.
Author: Fred Senese email@example.com
Copyright © 1997-2010 by Fred Senese
Comments & questions to firstname.lastname@example.org
Last Revised 08/17/15.URL: http://antoine.frostburg.edu/chem/senese/101/measurement/faq/print-does-ice-weigh-more-than-water.shtml