Ammonium hydroxide is a common name for ammonia solutions. It is a colorless liquid with a pungent odor. It is used in various industrial processes, including cleaning, refrigeration, and fertilizers. Synonyms for ammonium hydroxide include ammonia water, aqua ammonia, and ammonium solution. Aqua ammonia is most commonly used in the refrigeration industry as a coolant and also as a cleansing agent. Ammonium solution is commonly used in fertilizer since it is an excellent source of nitrogen for plants. Lastly, ammonia water also works as a cleaning agent for household purposes and acts as a disinfectant when mixed with other cleaning agents.