Ice skates glide across the surface thanks to a thin layer of water that forms due to the pressure exerted by the skate blade on the ice.
How the gliding works
When the skater's weight acts on the blade, the pressure increases at that point of contact, which lowers the melting point of the ice. This causes the ice to partially melt, creating a layer of liquid water that acts as a lubricant. This tiny layer (on the order of micrometers) allows the skate to move with less friction, making gliding easier.
Factors that influence it
- Temperature: At temperatures close to 0 °C, the effect is more pronounced, since ice is more prone to melting under pressure.
- Pressure: The greater the pressure applied (depending on the skater's weight and the shape of the blade), the more the water layer is generated.
- Surface roughness: Very smooth, clean ice allows for more efficient gliding.
This phenomenon, known as the pressure melting point effect, is essential to understanding how ice skates work and why cold ice can be so slippery.
