Interactive Self-Study Module: Solid-Solid-Liquid Phase Diagrams


This module uses screencasts and interactive simulation(s) to explain phase changes on a solid-solid-liquid phase diagram and utilizes the lever rule to determine the relative fraction of each component in each phase. It then provides example problems to allow the user to test themselves. Your retention of material in this module will increase if you write down reasons for your answers to ConcepTests, questions in screencasts, and questions to answer before using interactive simulation(s), and you try to solve the example problems before watching the solutions in the screencasts. We suggest using the learning resources in the following order:

  1. Attempt to answer the multiple-choice ConcepTest and solve the example problem before watching the screencasts or working with the simulations.
  2. Watch the screencasts that describe the phase diagrams and answer the questions within the screencasts.
  3. Review important equations for solid-solid-liquid phase diagrams.
  4. Use the interactive simulation(s) to further understand the behavior of the phase diagrams.
  5. Try to solve the example problems before watching the solutions in the screencasts.
  6. Answer the ConcepTests.
  7. Look at the list of key points, but only after you try to list the key points yourself.
  • This module is intended for a thermodynamics course or a materials course.
Before studying this module, you should:
After studying this module, you should be able to:
  • Given temperature and mole fraction, use solid-solid-liquid phase diagrams to identify which phases are present.
  • Identify regions where phase changes occur on a phase diagram.
  • Be able to draw and label a solid-solid-liquid phase diagram.