The expansion of a gas into a vacuum is an irreversible process. Likewise, ice melting at room temperature and water freezing at -30°C are irreversible processes.

For Example, when the iron is exposed to air and moisture, rust formation takes place. Rust is nothing but Iron Oxide; a new substance formed out of the reaction. The colour of the surface of the iron also changes. Hence, rusting of iron is a chemical change.

A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. Physical changes can further be classified as reversible or irreversible. The melted ice cube may be refrozen, so melting is a reversible physical change.

Processes such as melting, boiling, evaporation, freezing, condensation, dissolution are reversible changes. Few examples are melting of wax, freezing of ice, boiling water which evaporates as steam and condenses back to water.

Like, turning of water into ice is an example of reversible changes but growth in height is an irreversible change. Chemical changes are changes that occur in the chemical properties of the substance like its flammability, radioactivity, etc.

A reversible change is a chemical change where no new materials are created and the original material can be recovered. Examples include freezing water to make ice or melting chocolate.

Yes, electricity and light can bring reversible and irreversible changes. Reversible change – The light illuminate it’s surrounding’s environment which is reversible when we turn off the source of the light.