How does the surface tension help in skating?
We know that, with increase of pressure, melting point of ice decreases. Under the skater, ice melts and small tiny water droplets are formed. Due to the small size of water droplets, the excess pressure inside the droplets is sufficiently high and the drops remain spherical in shape. Thus, under the pressure of the skater, drops remain spherical in shape and acts as a ball bearing. Hence, the skater rolls over the drops.