Ammonia (NH3) is a colorless gas with a sharp, pungent odor, widely used in fertilizers, industrial refrigeration, and chemical synthesis for products like nitric acid and urea. It is highly corrosive and toxic, causing severe irritation to eyes, skin, and respiratory systems. Ammonia is highly soluble in water, forming ammonium hydroxide, and acts as an oxidizer, supporting combustion. Stored as a compressed gas or liquid, it requires careful handling with protective equipment and ventilation to prevent exposure and chemical burns. Its environmental release is regulated due to its toxicity and potential to form harmful aerosols.