Q. 19

During summers in India, one of the common practices 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 PT diagram of water.

Answer :

The process of making an ice ball deals with interconversion of the states of water.


While making an ice ball, we apply pressure on the crushed ice. The temperature is 0°C and the atmospheric pressure is 1 atm. Increasing this pressure shift the state from solid to liquid as indicated by the circle. Due to this, a part of the crushed ice melts and fills any gaps present in between ice flakes. When we release pressure, the water again solidifies to ice thus making the ice ball.


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