Question

Two cubes of ice are pressed hard between two palms. After relasing the pressure the cubes join together. Why?

Answer 1

We know that:-

Pressure is directly proportional to temperature.So when we apply pressure, temperature increases and the ice in contact starts to melt and turns into water. 

When pressure is removed, the temperature decreases again and the melted ice freezes again. Hence cubes join together.

But it will not happen always.It occurs mostly when the cooling is sufficient to refreeze the melted ice cubes.