Phase Diagrams
Download 1.39 Mb.
|
- Navigate this page:
- C. Two Important Points
- The critical point
- How is the normal melting and boiling points determined in a phase diagram
- How does the phase diagram of water look like
Sublimation (or deposition) curve – the curve on a phase diagram which represents the transition between gaseous and solid states. It represents the effect of increased temperature on a solid at a very low constant pressure, lower than the triple point.C. Two Important PointsC. Two Important PointsThere are two important points on the diagram, the triple point and the critical point.The triple pointThe triple pointThe triple point is the combination of pressure and temperature at which all three phases of matter are at equilibrium. It is the point on a phase diagram at which the three states of matter coexist. The lines that represent the conditions of solid-liquid, liquid-vapor, and solid-vapor equilibrium meet at the triple point.The critical pointThe critical pointThe critical point terminates the liquid/gas phase line. It is the set of temperature and pressure on a phase diagram where the liquid and gaseous phases of a substance merge together into a single phase. Beyond the temperature of the critical point, the merged single phase is known as a supercritical fluid.The critical pointThe critical pointThe temperature and pressure corresponding to this are known as the critical temperature and critical pressure.If the pressure on a gas (vapor) is increased at a temperature lower than the critical temperature, the liquid-vapor equilibrium line will eventually be crossed and the vapor will condense to give a liquid.How is the normal melting and boiling points determined in a phase diagram?How is the normal melting and boiling points determined in a phase diagram?The normal melting and boiling points are those when the pressure is 1 atmosphere.How does the phase diagram of water look like?How does the phase diagram of water look like?Download 1.39 Mb. Share with your friends:
|