Everyday Science, Everyday Wonder
A Winter Mystery Explained by Science
In winter, many of us have slipped on ice — while walking, skating, or just stepping outside.
We often wonder: “Why is ice so slippery?”
It looks hard and solid. It feels cold. So why does it make us fall so easily?
The answer isn’t just “because it’s ice.” The real reason is much more interesting — and it’s all about science
Pressure Makes Ice Melt
When something sharp — like the blade of a skate — presses down on ice, it creates strong pressure. This pressure causes a thin layer of ice to melt. Scientists call this pressure melting.
Even though it’s very cold, the pressure lowers the melting point of the ice, and a tiny layer of water forms on the surface.
This invisible water layer works like oil or soap — it makes the surface super slippery.
So, when you walk or skate on ice, you're actually sliding on a thin film of water!
Friction Makes Ice Melt, Too
When you move across ice, your shoes or skates create friction — and friction makes heat.
That heat melts the surface of the ice just a little more. Again, this creates more of that slippery water layer.
So the more you move, the more the ice melts — and the more slippery it becomes.
It’s like the ice is helping you slip on purpose!
But What About -20°C?
Here’s a tricky question:
Even on super cold days — like -20°C — ice is still slippery.
But at that temperature, pressure and friction shouldn’t melt ice so easily. So, what’s going on?
Scientists discovered something amazing. The surface of ice always has a very thin layer of quasi-liquid water — even in extreme cold.
This layer is always there, like a “built-in” slippery coating on the ice. It’s part of how ice works!
So, even if it’s freezing, that tiny water layer keeps the ice slippery.
Next Time You Walk on Ice...
Remember — you’re not just walking on frozen water.
You're walking on a surface shaped by pressure, friction, and an invisible water layer. It’s not magic — it’s science!
The next time you step onto an icy path, think about the secret science beneath your feet.
And of course… walk carefully. Science is fun — but slipping still hurts!
Stay tuned for the next story in our Everyday Science series.
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