Science
fromWIRED
6 days agoNo One Is Quite Sure Why Ice Is Slippery
Ice surfaces are coated by a thin liquidlike layer causing slipperiness; proposed causes include pressure melting, frictional heating, and a recent fourth hypothesis.
The reason we can gracefully glide on an ice-skating rink or clumsily slip on an icy sidewalk is that the surface of ice is coated by a thin watery layer. Scientists generally agree that this lubricating, liquidlike layer is what makes ice slippery. They disagree, though, about why the layer forms. Three main theories about the phenomenon have been debated over the past two centuries.