The chemical formula for ammonia is NH₃. Ammonia is a compound composed of one nitrogen atom (N) and three hydrogen atoms (H). It is a colorless gas with a distinct, pungent odor and is highly soluble in water, forming a solution known as ammonium hydroxide. Ammonia plays a crucial role in various applications, including agriculture as a fertilizer, in cleaning products, and as a refrigerant in industrial processes. Its nitrogen content is essential for plant growth, making it a vital component in the nitrogen cycle within ecosystems.