Values at 25 o C /77 o F / 298 K and 1 atm., if not other temperature and pressure given.
If values are given for liquid ammonia at ambient temperature, the ammonia is pressurized above 1 atm.
For full table with Imperial units - rotate the screen!
|Acidity (pKa) at -33°C||32.5|
|Critical density||14327||mol/m 3||243.99||kg/m 3||15.23||lb/ft 3||0.4734||slug/ft 3|
|Critical pressure||11.357||MPa=MN/m 2||113.57||bar||112.08||atm||1647.2||psi=lbf/in 2|
|Critical volume||69.8||cm 3 /mol||0.00410||m 3 /kg||0.0657||ft 3 /lb||2.11||ft 3 /slug|
|Density , gas||41.1||mol/m 3||0.699||kg/m 3||0.0437||lb/ft 3||0.00136||slug/ft 3|
|Density, liquid at -28 °F/-33.35°C, 1 atm||40868||mol/m 3||696||kg/m 3||43.4||lb/ft 3||1.35||slug/ft 3|
|Density, liquid at 70 °F/21.1°C||36259||mol/m 3||617.5||kg/m 3||38.55||lb/ft 3||1.198||slug/ft 3|
|Gas constant , R||488.2||J/kg K||0.1356||Wh/(kg K)||90.74||ft lb f /lb °R||2919||ft lb f /slug °R|
|Gibbs free energy of formation, ΔG f||-16.6||kJ/mol||-975||kJ/kg||-0.42||Btu/lb|
|Heat (enthalpy) of combustion , ΔH c (gas)||382.8||kJ/mol||22477||kJ/kg||9.663||Btu/lb|
|Heat (enthalpy) of evaporation , ΔH v , at boiling point||23.37||kJ/mol||1372.0||kJ/kg||589.87||Btu/lb|
|Heat(enthalpy) of formation , ΔH f (gas)||-45.9||kJ/mol||-2695||kJ/kg||-1.16||Btu/lb|
|Heat (enthalpy) of fusion/melting, ΔH m||5.653||kJ/mol||332.3||kJ/kg||143||Btu/lb|
|Heat (enthalpy) of sublimation, ΔH S , at 180 K||31.2||kJ/mol||1832||kJ/kg||0.79||Btu/lb|
|Melting (freezing) point||195.42||K||-77.73||°C||-107.91||°F|
|pH of 0.01 N aqueous solution||10.6|
|pH of 0.1 N aqueous solution||11.1|
|pH of 1.0 N aqueous solution||11.6|
|Standard molar entropy , S° (gas) at 1 bar||192.77||J/mol K||11.32||kJ/kg K||0.002704||Btu/lb °F|
|Solubility in water, at 20°C||540||mg/ml|
|Solubility in water, at 24°C||482||mg/ml|
|Sound velocity in gas||415||m/s|
|Specific Gravity , gas (density relativ to air)||0.604|
|Specific heat (heat capacity), Cp (gas)||37.0||J/mol K||2.175||kJ/kg K||0.5200||Btu/lb°F |
= cal/g K
|Specific heat (heat capacity), Cp (liquid)||80.8||J/mol K||4.744||kJ/kg K||1.133||Btu/lb°F |
= cal/g K
|Specific heat ratio - C p /C v (gas)||1.32|
|Specific volume||0.02435||m 3 /mol||1.43||m 3 /kg||22.91||ft 3 /lb||736.99||ft 3 /slug|
|Surface tension at 11.1°C/52.0°F||23.4||dynes/cm|
|Surface tension at 34.1°C/93.4°F||18.1||dynes/cm|
|Thermal Conductivity||0.026||W/m°C||0.015||Btu/hr ft °F|
|Triple point pressure||0.00609||MPa=MN/m 2||0.0609||bar||0.0601||atm||0.883||psi=lb f /in 2|
|Triple point temperature||195.5||K||-77.65||°C||-107.77||°F|
|Vapor (saturation) pressure||1.00||MPa=MN/m 2||7500||mm Hg||9.869||atm||145.0||psi=lb f /in 2|
|Vapor (saturation) pressure at -49.72°F/-45.4°C||0.0533||MPa=MN/m 2||400||mm Hg||0.526||atm||7.73||psi=lb f /in 2|
|Viscosity, dynamic (absolute) (gas)||0.0100||cP||6.72*10-6||lbm/ft s||0.209*10-6||lb f s/ft 2|
|Viscosity, dynamic (absolute) at 27°C (liq)||0.1293||cP||86.89*10-6||lbm/ft s||2.70*10-6||lb f s/ft 2|
|Viscosity, dynamic (absolute) at -33.5°C (liq)||0.255||cP||171.4*10-6||lbm/ft s||5.326*10-6||lb f s/ft 2|
See also the following documents for changes in ammonia properties with changes in pressure and temperature:
See also more about atmospheric pressure , and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,
as well as Thermophysical properties of: Acetone , Acetylene , Air , Argon , Benzene , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Helium , Hydrogen , Hydrogen sulfide , Methane , Methanol , Nitrogen , Oxygen , Pentane , Propane , Toluene , Water and Heavy water, D 2 O .
Ammonia is a gas at standard conditions. However, at low temperature and/or high pressures the gas becomes a liquid. The phase diagram for ammonia shows the phase behavior with changes in temperature and pressure. The curve between the triple point and the critical point shows the ammonia boiling point with changes in pressure.
Below the triple point temperature, ammonia becomes a solid, this phase will also be present at very high pressure (> 10 000 bar) and ambient temperature.
At the critical point there is no change of state when pressure is increased or if heat is added.
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