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While boiling, only physical change is occur in the case of water. Boiling a liquid involves the process of heating it continuously for some length of time until its vapor pressure becomes equal to the pressure of surrounding environment and a continuous process of conversion of liquid to vapors (gaseous form of the liquid) commences. At this point the temperature of the liquid becomes constant and further continued heating does not result in any further rise in temperature of the liquid. Following picture shows the rise and ultimate stabilization of temperature at boiling point for one such experiment.
During the process of boiling if the water vapors are collected
and cooled then the water is obtained again. Thus the forming of vapors
is seen to be a reversible process. Water obtained by condensation of
vapors as also the boiling water left in the pan show the same chemical
properties as the water that was taken for experiment. This
shows that boiling water results in no chemical change. If water is
just heated to its boiling temperature then there is a physical change
of rise in temperature and if it is boiled for some time then there is a
physical change from liquid to gaseous state.