Question

2 cubes of ice are pressed hard between the palms, when the pressure is released, the 2 cubes join together. Explain.

Answer 1

The melting and boiling melts of a substance depend upon the pressure. For example, water boils at 100 deg C at sea level, but at a lower temperature on the top of Mount Everest.

When the two ice cubes are pressed together, the increased pressure raises lowers the melting point temperature just enough for the two surfaces turn liquid. When the pressure is released, the melting point temperature goes back up and the water freezes.
This is the principle behind how ice skates work. The weight of the skater causes a thin film of ice to form where the blade meets the ice. The water acts as a lubricant allowing the blade to glide over the ice.

Answer 2

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1. When crushed ice is pressed, its melting point is lowered and some ice melts to form water.

2. When pressure is released, the melting point becomes normal and the water freezes to form ice forming a lump. Hence, two ice cubes get joined together.

Hope it helps!

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