A scientific mystery still unsolved “”””Why is ice slippery?””””

First) Why is ice slippery?

It seems like a tautology, but

Similarly, marble with low friction cannot be skated on.

Kelvin) A layer of water has formed and it is slippery!

Usually, the volume increases in the following order: solid < liquid < gas. Water has a larger volume in ice state due to its hexagonal structure So when you apply pressure to ice, it turns into water. The theory is that this forms a layer of water on top of the ice, making it slippery. But like minus 20 or 30 degrees Even at temperatures where ice would never melt under pressure. Ice is still slippery Borden and Hughes) Ice is slippery because it melts due to frictional heat!

The theory that a water layer is formed due to friction even at low temperatures

But even if you stand still on the ice, it is still slippery.

As a result of the experiment, even in an environment without pressure and friction at sub-zero temperatures,

There is a very thin layer of water on top of the ice.

It was slippery because there was always a layer of water!

Then, if you sprinkle water on the marble,

It should be as slippery as ice.

I said it was because of the water layer.

But that’s not the case

The situation still requires further research.