begin mathsize 48px style F equals C minus P space plus 2 end style

F= Number of Variables ; C= Number of Components ; P= Number of Phases;






Phase rule (Gibbs' Phase rule) is a very simple tool to determine the number of degrees of freedom of a system. The term F , or degrees of freedom implies the number of properties that can be altered independently without altering the state of the system. Often F is reffered as as the variance of the system.        

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