Chemistry
Thermodynamics of Liquid–Liquid Phase Separation in Binary Mixtures
Quick fact
Some binary liquid mixtures can separate into two coexisting phases at a certain temperature, but the same mixture becomes a single phase at higher or lower temperatures—this is the basis of upper and lower critical solution temperatures.
Why this is interesting
Have you ever shaken a bottle of oil and water and watched it separate into layers? What makes some liquids mix completely, while others refuse to blend?