The Haber process is a chemical reaction that combines nitrogen gas (N₂) and hydrogen gas (H₂) under high pressure and temperature in the presence of a catalyst to produce ammonia. The balanced chemical equation for the reaction is:

N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

Ammonia is a crucial chemical used in various industries, including fertilizer production, explosives, and pharmaceuticals.