The main physical properties of anhydrous ammonia are:

NH3 Molecular Formula
Molecular mass 17.03 kg / kmol
Boiling point at 1.0 atm -33.4 ° C
Freezing Point at 1.0 atm -77.9 ° C
Critical Pressure 113.5 bar abs
Critical Temperature 132.4ºC
Specific volume at 1.0 atm and 0.0ºC 1.2954 m3 / kg
Density of the saturated liquid at 35.0ºC 587.4 kg / m3
Ignition point 651ºC