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As water freezes it forms a crystal lattice. As the lattice forms it pushes impurities away from the formation front. This is why ice cubes are clear at the edg
by woleium 4y ago
As water freezes it forms a crystal lattice. As the lattice forms it pushes impurities away from the formation front. This is why ice cubes are clear at the edges and discolored in the center, the impurities are all pushed to the last place to freeze, the middle. By taking the top of the frozen lake he's getting the (more) pure water, similar to the edge of an ice cube.
- dotancohen 4y agoIn summer I freeze 1 liter plastic bottles of spring water before a long trip. I've noticed that removing the cap and licking the ice near the top reveals it to be salty. Could that be because the impurities have been pushed out?