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Give limitations of phase rule.
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  • Phase rule deals with system in equilibrium and is not of much help for the systems which attain equilibrium slowly.

  • Since no quantitative analysis is done, it is necessary to determine exactly the number of phases present under the equilibrium conditions.

  • Though each solid is supposed to constitute a single phase, phase rule cannot be applied to solids in finely divided state.

  • It does not furnish enough information regarding the extent of changes when the system shifts from one equilibrium to another.

  • It conditions that all phases of the system must be present simultaneously, under the identical conditions of temperature and pressure.

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