Solution:● If we take melted wax and cool it, it will convert back to its original state.
● Wax melting is reversible.
● Once the wax has evaporated and converted to gaseous form, the burning of a candle cannot be reversed. It is impossible to solidify and turn it into a candle structure. The act of lighting a candle is irreversible.
● When a candle burns, its size shrinks and cannot be restored to its former size.The reduction in candle size during burning is irreversible.
● We can heat the solidified form of wax to return it to its original state.It is possible to reverse the solidification of melting wax.