![]() Tabulated values given in SI and imperial units, and unit converters are given below the figures. The figures below show the changes in thermophysical properties along the ammonia boiling and condensation curves: Density, viscosity, heat capacity, thermal conductivity. Triple point : The temperature and pressure at which the three phases (gas, liquid, and solid) of a substance coexist in thermodynamic equilibrium At the critical point, defined by the critical temperature T c and the critical pressure P c , phase boundaries vanish.Ĭritical temperature of ammonia: 405.56 K =132.41 ☌ = 270.34 ☏Ĭritical pressure of ammonia: 112.08 atm = 113.41 bar = 11.357 MPa (MN/m 2 ) = 1647.2 psi (=lb f /in 2 ) At higher temperatures, the gas cannot be liquefied by pressure alone. ![]() The curve between the triple point and the critical point shows the ammonia boiling point with changes in pressure.Ĭritical point : The end point of the pressure-temperature curve that designates conditions under which a liquid and its vapor can coexist. The ammonia phase diagram shows the phase behavior with changes in temperature and pressure. However, at low temperature and/or high pressures the gas becomes a liquid, and at more extreme conditions, a solid. ![]() At standard conditions, ammonia is a gas. ![]()
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