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Ice melts under ice-skating blades for two reasons: friction and the weird physical properties of water.

Notsurprisingly there is some friction when the blade slides across the ice, and the friction converts to heat - which can help melt the ice.


The strange thing about water is that it actually expands upon freezing. Applying pressure to it - consequently making it more dense - actually shifts the ice back towards the physical state of liquid, which is more dense. This phenomena is not true over the entire pressure-temperature phase space of solid water, but it is true in the phase space near atmospheric pressure and normal ambient temperature conditions.

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