Why “pressure melting” fails at very cold temps

10:38>> simply applying pressure from your ice gate onto the ice is no longer going to change that surface layer from its solid state to its liquid state. >> To its liquid state. And so you actually got it right there. The surface layer. There's some different physics happening at the surface layer. Interesting. And we can't count on the big equations that we use in statistical mechanics. For example, the main one is the Clausius Clapperon equation. And that's the one that gives us this phase diagram. We can actually use that in this scenario. >> And what we need to do is think about what is actually happening at the surface level. It can't be pressure because of what I just told you, right? It's not enough to explain the

11:20slipperiness of ice at really, really cold temperatures at -20° C. >> So in 1939, Bowen and Hughes came up with an explanation. They said that actually there's heat generated by friction. >> Mhm. >> And that heat is what causes melting.