What is a phase?
A phase is a physically distinct, homogeneous and mechanically separable part of a heterogeneous
system. 


 What is a component?

 Smallest no. of independent variables which are required to define composition of each phase (directly or by equation). 


What is Degree of Freedom?

number of variable factors (such as temperature,
pressure and concentration of the phases) which must be fixed to define the condition of a which must be fixed to define the condition of a 
system completely.

When number of phases is one , When Degree of freedom is zero is known as  Quintuple point




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