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Anhydrous ammonia is used in Refrigerators. Anhydrous ammonia is a clear liquid that boils at a temperature of -28°F. In refrigeration systems, the liquid is stored in closed containers under pressure. When the pressure is released, the liquid evaporates rapidly, generally forming an invisible vapor or gas. For changing its state (form liquid to gas), the bonds need kinetic energy. The (heat) energy is taken from its environment (inside the refrigerator), which changes in kinetic energy. Due to which, evaporation occurs. The rapid evaporation causes the temperature of the liquid to drop until it reaches the normal boiling point of -28°F, a similar effect occurs when water evaporates off the skin, thus cooling it. This is why ammonia is used in refrigeration systems

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