Ammonia (NH₃) is an inorganic compound. At normal temperature and pressure, it is a colorless gas with a strong pungent odor. Its main applications include: manufacturing nitrogen fertilizers (such as urea, ammonium nitrate) to support global agriculture; producing various chemical products such as nitric acid, explosives, plastics, and synthetic fibers; moreover, due to its large latent heat of vaporization, it is also used as an industrial refrigerant.