Question: In Figure is shown the pressure?temperature phase diagram for H 2 O. Apply the Gibbs phase rule at points A, B, and C; that is,

In Figure is shown the pressure?temperature phase diagram for H₂O. Apply the Gibbs phase rule at points A, B, and C; that is, specify the number of degrees of freedom at each of the points?that is, the number of externally controllable variables that need be specified to completely define the system.

10,000 Ice II 1,000 100 Liquid 10 1.0 Icet 0.1 Vapor 0.01

10,000 Ice II 1,000 100 Liquid 10 1.0 Icet 0.1 Vapor 0.01 0.001 -20 20 40 60 80 100 120 Temperature ("C) Pressure (atm)

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