Why does an ice cube melt in the mouth?

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.

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.

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

Solid-state phase transitions

The kinetics of phase changes

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.

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

temperature-pressure phase diagram of water

Phase rule F = C –P + 2