(which has a higher boiling point) behind. Some water vapor and bubbles remain mixed with the ammonia; this water is removed in the final separation step, by passing it through the separator, an uphill series of twisted pipes with minor obstacles to pop the bubbles, allowing the water vapor to condense and drain back to the generator. The pure ammonia gas then enters the condenser. In this heat exchanger, the hot ammonia gas transfers its heat to the outside air, which is below the boiling point of the full-pressure ammonia, and therefore condenses. The condensed (liquid) ammonia flows down to be mixed with the hydrogen gas released from the absorption step, repeating the cycle. See also Adsorption refrigeration Icyball Quantum absorption refrigerator RV Fridge References Further reading External links Absorption Heat Pumps (Office of Energy Efficiency and Renewable Energy). Arizona Energy Explanation with diagrams Lithium-Bromide / Water Cycle – Absorption Refrigeration for Campus Cooling at BYU. Thermodynamic cycles Heat pumps Cooling technology Heating, ventilation, and air conditioning Gas technologies Refrigerators