Mr. Bouyer - Day 4

Phase Diagram:
a graph showing the phases of a substance as they relate to temperature and pressure.

There are three lines on most phase diagrams:

• Solid-liquid line - The line between the solid and liquid areas on the diagram.
• Liquid-vapor line - The line between the liquid and vapor areas on the diagram.
• Standard atmospheric pressure line - The dotted horizontal line on the diagram drawn at 101.325 kPa.

• Triple point, TP - All three phases can exist in equilibrium at this temperature and pressure. This is the point on the diagram where the solid-liquid line and the liquid-vapor line meet.
• Normal boiling point, T_b - The temperature at which the vapor pressure of a liquid is equal to standard atmospheric pressure. This is the point on the diagram where the standard atmospheric pressure line crosses the liquid-vapor line.
• Normal melting point, T_m - The temperature at which the vapor pressure of the solid and the vapor pressure of the liquid are equal. This is the point on the diagram where the standard atmospheric pressure line crosses the solid-liquid line.
• Critical temperature, T_c - The temperature above which no amount of pressure will liquify a vapor. This is the point on the diagram where the liquid-vapor line becomes vertical.

Homework Assignment 204:
This assignment must be turned in by the beginning of class tomorrow to receive credit.
Scoring criteria

1. Find the following information for water:
   1. Triple point temperature and pressure.
   2. Normal boiling point temperature.
   3. Normal melting poing temperature.
   4. Critical temperature.