Question

why frozen water is lighter than liquid water
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Answer 1

Answer:

When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. ... Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density. Hence, Ice is lighter than water.

Answer 2

simple answer is that ice is less dense than water. The question then becomes: Why is ice, which is water in solid form, lighter than water in its liquid form? Something must be happening to water when it freezes. ... Because the same weight or mass now takes up more space, it is less dense and floats on water.