The buses used an internal combustion engine that ran on a combination of ammonia and coal gas. The X-15 aircraft also used ammonia as one component in the fuel that powered its rocket engines.

An ammonia molecule contains three atoms ... the relationship between the engine’s intake system and the gas flow inside the cylinders. The scientists used an optical single-cylinder engine ...

The colorless gas composed of nitrogen and hydrogen (NH₃ ... human remains were found in an anhydrous ammonia tank on a ...