The melting point or boiling point ...................
The melting point or boiling point of a substance at a specific pressure - Apex
A point can represent a piece of data or an (x,y) value.
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The melting point or boiling point ...................
meet at the critical point on the diagram.
This point is call the "triple point" and this is where all three lines meet together on the phase diagram.
This only occurs at a specific point on the phase diagram of a substance called the "triple point." This point corresponds to a certain pressure and temperature for an individual substance, since these are the axis values for a phase diagram.
This is the critical point.
At the triple point three phases coexist in equilibrium: solid, liquid and gas.
The triple point of a phase diagram is the location where the solid, liquid, and gas phases meet; it is the temperature and pressure at which a given substance can assume any of the 3 usual phases of matter.
pie graph
a point indicating three phases in dynamic equilibrium
Draw a vertical line through the triple point.
(Explanation): If you look at the phase diagram for CO2, and you draw a lines where the temperature and pressure meet, you will see that the point will be inside the zone that is 'solid', so it is in the solid state.
The phase line between solid and liquid represents the melting point.The line dividing solid from gas is the sublimation point.The line dividing liquid from gas is the boiling point.