Definition: The word "ammonia" is a chemical compound composed of nitrogen (N) atoms bonded to hydrogen atoms. It is also known as ammonium or ammonium nitrate, due to its formula NH4. The specific chemical formula for ammonia is N2H4. The atomic number of nitrogen (N) in this compound is 14 and the atomic mass of nitrogen is approximately 14.01 g/mol. In terms of definition, ammonia is a gas that is produced during the combustion process of certain organic compounds. It is used as an oxidizing agent and as a reducing agent in some chemical reactions, particularly those involving the action of acids on metals or other bases. The word "ammonia" can also refer to the substance itself (N2H4), its structure (NH4), or its specific properties (as a gas, as a reducing agent, etc.).