2. Why does an ice cube melt in the mouth?

3. Phase diagrams
Phase:is a form of matter that is uniform throughout in chemical composition and physical state.
Phase transitions:the spontaneous conversion of one phase into another phase,occurs at a characteristic temperature for a given pressure.
Transition temperature:the temperature at which the two phases are in equilibrium and the Gibbs energy of the system is minimized at the prevailing pressure.

4. A phase is a component within a system,
existing in a precisely defined physical state,
e.g. gas, liquid, or a solid that has a single
crystallographic form.
A phase diagram is a graph showing values
of applied pressure and temperature at which equilibrium exists.
A phase boundary is a line on a phase diagram representing values of applied pressure and temperature at which equilibrium exists.

5. The triple point on a phase diagram represents the value of pressure and temperature at which three phases coexist at equilibrium

7. Solid-state phase transitions

8. The kinetics of phase changes

9. Pressure and temperature changes with a single-component system: qualitative discussion
Effect of temperature on a phase change: sublimation
How is the ‘Smoke’ in horror films made?
Dry ice is solid carbon dioxide.

11. How does freeze-drying work?
Effect of pressure change on a phase change

13. temperature-pressure phase diagram of water

14. Phase rule
F = C –P + 2