A little confused about phase diagrams...

[PeterPesto]

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So does each region correspond to a single phase (solid, liquid, and gas)? Does that mean, a liquid isn't emitting ANY vapor where it within the boundaries, or does it mean that it isn't in equilibrium with it's vapor / solid?

It's hard for to believe that moving left to right in a phase diagram of water at 1 atm, ice melts into water, and then ONLY at 1 atm pressure does vaporization occur. But that's what it says in my chemistry book.

 

[Rabolisk]

Surely molecules on the surface are capable of evaporating, but water only boils at a specific temperature in a given external pressure. There is vapor pressure due to water when it is in a closed container not exposed to the atmospheric pressure. Then the vapor pressure will depend on the temperature, and water will bee in equilibrium with vapor.