This is, in a thermodynamic context, the change of state of a system from one phase into another phase.

Explanation : In a thermodynamics, the change of state of a system from one phase into another phase is called Reversible change.

So, we can say that the reversible change that occur when a substance changes from one phase to another phase without formed a new compound.

Example : Ice

When Ice is heated then the ice melts and change its state. Now if melt ice is cooled, then it come back to ice form this process is reversible change.

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