Show how two phase regions only need one variable to complete define the phase compositions as...

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Show how two phase regions only need one variable to complete define the phase compositions as opposed to single phase fields

engineering Mechanical-Engineering

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Answer 1

Answer #1

According to Gibbs Phase rule

F = C - P + 2

F is the number of degrees of freedom or number of variable to define phase

C is the number of components

P is the number of phases

For pure substance C = 1

So, F = 1 - P + 2

F = 3 - P

Case 1: For two phase regions i.e P =2

F = 3 - 2

F = 1

therefore two phase regions need only one variable to completely define phase

Case 1: For single phase regions i.e P =2

F = 3 - 1

F = 2

therefore single phase regions need two variable to completely define phase

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Answer 2

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