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HOW THE WORLD WORKS · Ep. 3

The Lid

Why does the ice on your pond float instead of sinking?

The film asks: Have you skated on one? · Yes / Never / Fell through

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What it says
  1. Why does the ice on your pond float instead of sinking?
  2. Because water is strange. It grows when it freezes.
  3. Its molecules lock into a lattice with gaps, so ice is lighter than the water under it.
  4. So the pond freezes from the top, and the ice is a lid, not a stone.
  5. Under the lid the water stays liquid, and the fish keep swimming.
  6. Have you skated on one?

03). A frozen pond: skaters above, fish below. A cutaway shows the water column; the molecules are little balls. As they freeze they lock into a lattice with gaps, so the ice is lighter than the water and floats. The pond freezes from the top; the ice is a lid, not a stone; under it the fish keep swimming.

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