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Water expands when it freezes because, due to the hydrogen bonding, it forms a tetrahedral lattice. Other things that expand when frozen include silicon, bismuth, antimony, gallium, and germanium

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http://en.wikipedia.org/wiki/Properties_of_water#Density_of_water_and_ice

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15y ago

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Does properly air-entrained cement paste shrink or expand upon freezing?

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