Phase Diagram, what phases exist when....

[johnwandering]

So one of the answers to a question i was working on notes that:

When right dab in the middle of the liquid area, the matter exists as Liquid AND vapor. Just liquid is a wrong answer.
It notes that the matter is in constant equilibrium.


However, does this only apply for liquids and gases?
For example, if the question asked about a point smack dab in the middle of solid, it would just be solid present right??
What if the question asked for gases? Would it also include some liquid?

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[PiBond]

So one of the answers to a question i was working on notes that:

When right dab in the middle of the liquid area, the matter exists as Liquid AND vapor. Just liquid is a wrong answer.
It notes that the matter is in constant equilibrium.


However, does this only apply for liquids and gases?
For example, if the question asked about a point smack dab in the middle of solid, it would just be solid present right??
What if the question asked for gases? Would it also include some liquid?

there is some (minute amount) vapor above solids.

 

[johnwandering]

So if the question asked

"what phases exist on point A"
with point A smack dab in the middle

It would be correct to say Solid and vapor
and wrong to say just soild??