Three solid substances x, y and z are heated, the number of free surfaces of substance X and y decreases to zero and one respectively. The number of free surface of z does not change. The substance associated with an increase in potential energy is/are ___________.
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Three solid substances x, y and z are heated, the number of free surfaces of substance X and y decreases to zero and one respectively. The number of free surface of z does not change. The substance associated with an increase in potential energy is/are solid and liquid.
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