Ammonia - NH₃

Ammonia is, after sulphuric acid, the world's most produced industrial chemical. It is the starting substance for the production of fertilizers, nitric acid, plastics, and explosives among other things. 

Ammonia (NH₃), is a colourless gas with a distinct smell that is hazardous in high concentrations. 

Ammonia is irritating to the mucous membrane and can in small amounts cause problems to the respiratory passage.  

Properties

Molecular weight 17.03 g/mol. 

Gaseous phase Gas density (1.013 bar at boiling point): 0.889 kg/m³
 Gas density (1.013 bar and 15 °C (59 °F)): 0.7289

Solid phase Melting point: -77.74 °C

Liquid phase Boiling point: (1.013 bar): -33.33 °C
 Liquid density (1.013 bar at boiling point): 681.97 kg/m³

Critical point Critical temperature: 132.25 °C
 Critical pressure: 113.3 bar
 Critical density: 225 kg/m³