During summers in india, one of the common practice to keep cool is to make ice balls of crushed ice, dip it in flavored sugar syrup and sip it. For this a stick is inserted into crushed ice and is squeezed in the palm to make it into the ball. Equivalently in winter in those areas where it snows, people make snow balls and throw around. Explain the formation of ball out of crushed ice or snow in the light of P - T diagram of water.

Explanation

Refer to the p-T diagram of water and double headed arrow. Increasing pressure at `0^(@)C` and 1 atm takes ice into liquid state and decreasing pressure in liquid state at `0^(@)C` and 1 atm takes water to ice state.

When crushed ice is squeezed, some of it melts, filling up gap between ice flakes upon releasing pressure. This water freezes, binding all ice flakes and making the ball more stable.