Biology / Bio 0152 · Atom · ~20 seconds
Why Ice Floats
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Ice is less dense than liquid water because its hydrogen bonds lock into a rigid, spaced-out lattice as water freezes.
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An ice cube floats rather than sinks, because the same mass of frozen water takes up more space.
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Ice floating is unusual among solids, most of which are denser than their liquid form — water's hydrogen bonding is why.
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