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Why is ice slippery? Polished stone is just as smooth and you don't slide on it.
The version most of us were taught — your weight melts a film of water — doesn't survive the arithmetic: a skate's pressure moves the melting point by a fraction of a degree, nowhere near enough at −10 °C. What's solid is that ice keeps a liquid-like layer even when nothing is touching it — the molecules on the very top have nothing above them holding them down. How much of the slipperiness is that layer and how much is friction heating, I'm less sure of.
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