Why is liquid water more dense than ice?

Biology and Life Read more from
Chapter Basics of Biology

Pure, liquid water is most dense at 39.2°F (3.98°C) and decreases in density as it freezes. The water molecules in ice are held in a relatively rigid geometric pattern by their hydrogen bonds, producing an open, porous structure. Liquid water has fewer bonds; therefore, more molecules can occupy the same space, making liquid water denser than ice.


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