$8. English Breakfast is a full-bodied black tea blend that goes well with a traditional English breakfast. The original cup was made with black Keemun tea from Anhui province in China. Across many generations, plenty of different interpretations of this famous blend have been made.
Color saturation determines how certain hue will look in certain lighting conditions. For example, a wall painted with a solid color will look different during the day than it does at night. Because of the light, the saturation of the wall will change over the course of day, although it is still the same color. When the saturation is zero, what you will see is a shade of gray.
If you take the solid and liquid, or liquid and gas, or whatever the two phases are, then at the phase change the Gibbs free energies of the two components are the same because the two states are in equilibrium. The Gibbs free energy change in the transition is: $$ \Delta G = \Delta H - T \Delta S $$ where $\Delta H$ is the change in enthalpy and $\Delta S$ is the change in entropy. The temperature $T$ is a constant because the phase change occurs at constant temperature. At the phase change temperature $\Delta G$ is zero so: $$ \Delta H = T \Delta S $$ The enthalpy change $\Delta H$ is basically the heat emitted or absorbed during the phase change, and it's balanced by the change in entropy due to the phase change.