This point is call the "triple point" and this is where all three lines meet together on the phase diagram.
It is called the Triple Point
a diagram showing the effects of temperature and pressure on phase
By a line separating the phases.
The effect of temperature and pressure on the phase of a substance
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.
Phase diagrams typically show the boundaries between the different phases based on 2 or more variables. For 2 factor diagrams the variables may be temperature & pressure, volume & pressure (often with isotherms superimposed), temperature & composition, or (in the case of a 3 dimensional diagram, temperature, pressure & volume (where instead of isotherm lines, temperature becomes a variable on one of the 3 axes). The choice of variables depends on what you need to compare.
a diagram showing the effects of temperature and pressure on phase
By a line separating the phases
By a line separating the phases.
By a line separating the phases
The effect of temperature and pressure on the phase of a substance
The simplest phase diagrams are pressure-temperature diagrams of a single simple substance, such as water. The axes correspond to the pressure and temperature. The phase diagram shows, in pressure-temperature space, the lines of equilibrium or phase boundaries between the three phases of 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.
Some materials have multiple solid phases, others do not. It depends on the particular material and also on the temperature and pressure conditions. If you want to know what phases a specific material at a particular pressure goes through as it is heated from temperature X to temperature Y, that would be answerable by looking at a phase diagram for that material, but the generic form cannot be answered.
Phase diagrams typically show the boundaries between the different phases based on 2 or more variables. For 2 factor diagrams the variables may be temperature & pressure, volume & pressure (often with isotherms superimposed), temperature & composition, or (in the case of a 3 dimensional diagram, temperature, pressure & volume (where instead of isotherm lines, temperature becomes a variable on one of the 3 axes). The choice of variables depends on what you need to compare.
The pressure and temperature mostly the temperature.
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.
There is no boiling point in the p,T diagram: it is a line between the vapor and liquid phase.Cf. phase diagram in 'Related links' just below this answer][The simplest phase diagrams are pressure-temperature diagrams of a single simple substance, such as water.The axes correspond to the pressure and temperature.The phase diagram shows, in pressure-temperature space,the lines of equilibrium or phase boundaries between the three phases of solid, liquid, and gas.]