Question

In: Physics

In a two-component phase diagram [temperature (y) vs. composition (x)] the direction of the tie lines...

In a two-component phase diagram [temperature (y) vs. composition (x)] the direction of the tie lines must be determined experimentally.

Group of answer choices

True.

False, they can be inferred from the Lever Rule.

False, they are always horizontal.

Solutions

Expert Solution

False, they can be inferred from the lever rule.

The position of the point at each end of the tie line, at the boundary of the two-phase area, gives the value of the composition variable of one of the phases and also the
physical state of this phase: either the state of an adjacent one-phase area, or the state of a phase of fixed composition when the boundary is a vertical line. Thus, a
boundary that separates a two-phase area for phases and from a one-phase area for phase is a curve that describes the composition of phase as a function of T or P when it is in equilibrium with phase . The curve is called a solidus, liquidus, or vaporus depending on whether phase ’ is a solid, liquid, or gas.


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