A high-pressure, hot, liquid mixture of methanol and water is fed into an adiabatic flash drum. Because the flash drum pressure is below the bubble pressure, some of the liquid evaporates and the temperature decreases because energy is needed to evaporate the liquid. Thus, a vapor-liquid mixture in equilibrium exits the drum. Use the sliders to adjust the feed mole fraction of methanol, the feed temperature and the flash drum pressure. Material balances, an energy balance and Raoult’s law for vapor-liquid equilibrium are used to determine the amounts of liquid and vapor exiting the drum and the mole fractions in each phase.