The thermodynamics process that can be reversed, that is, brought back into the initial state by very small changes in the properties of the system is a reversible process. During a reversible process, there is no increase in the entropy of the system and the whole system is in perfect equilibrium with the surroundings.
The work done by the system in a reversible process,
W = ∫PdV,
where P = pressure of the system and V = volume.
On heating, ice cubes can be converted into the water while when we freeze water we get ice cubes. Hence, this is a reversible process.
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