This page provides supplementary chemical data on ammonia. Structure and properties Thermodynamic properties Vapor–liquid equilibrium data Table data (above) obtained from CRC Handbook of Chemistry and Physics 44th ed. The (s) notation indicates equilibrium temperature of vapor over solid. Otherwise temperature is equilibrium of vapor over liquid. Vapor-pressure formula for ammonia: log10P = A – B / (T − C), where P is pressure in kPa, and T is temperature in kelvins; A = 6.67956, B = 1002.711, C = 25.215 for T = 190 K through 333 K. Heat capacity of liquid and vapor Spectral data Regulatory data Safety data sheet The handling of this chemical may incur notable safety precautions... It is highly recommend that you seek the Safety Data Sheet (SDS) for this chemical from a reliable source and follow its directions. SIRI Science Stuff (Ammonia Solution) References External links Phase diagram for ammonia IR spectrum (from NIST) Chemical data pages Chemical data pages cleanup