NH 3, Anhydrous ammonia, refrigerant ammonia, It is all the same product with differing amounts of allowable water in the product. The word anhydrous means "without water". It has a boiling point of -21 deg F at atmospheric pressure. The most common usage today for ammonia as a refrigerant is the milk industry. It is further used by industries like Campbells Soups, and the like. Ammonia has an affinity for water and when possible, it will quickly go to and join with water but when it does, large amounts of heat are released in the process. This is the basic principal in the use of a system called absorption refrigeration when the refrigerant is ammonia. The most common type of system for most people to understand today is the gas refrigerator in the RV. Ammonia is corrosive to ferrous metals, copper, aluminum, brass, and like materials. All materials used must be good quality steel. My previous question which so far has not been answered is "How is it made"? It is made at the local "OIL" refinery as a byproduct of the production of gasoline, propane, and like hydrocarbon products. It's primary large scale usage today is agricultural, added to water while irrigating for the nitrogen in the growing of crops. Do we still want to use this product as an alternative energy ????? Bob
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