Ammonia (NH3) Properties

Thermodynamic properties - specific volume, enthalpy and entropy - of saturated and superheated ammonia

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The table below can be used to determine specific volume (v), specific internal energy (u), enthalpy (h), and entropy (s) of saturated and superheated ammonia - NH₃ - also known as refrigerant 717.

Saturated Properties							Superheated Properties (t - t_s)
Temperature - t_s - (^oC)	Pressure - p_s - (bar)	Specific Volume - v_i - (m³/kg)	Specific Enthalpy		Specific Entropy		50 K		100 K
Temperature - t_s - (^oC)	Pressure - p_s - (bar)	Specific Volume - v_i - (m³/kg)	saturated liquid - h_f - (kJ/kg)	saturated vapor - h_g - (kJ/kg)	saturated liquid - s_f - (kJ/kg K)	saturated vapor - s_g - (kJ/kg K)	Specific Enthalpy - h - (kJ/kg)	Specific Entropy - s - (kJ/kg K)	Specific Enthalpy - h - (kJ/kg)	Specific Entropy - s - (kJ/kg K)
-50	0.4089	2.625	-44.4	1373.3	-0.194	6.159	1479.8	6.592	1585.9	6.948
-45	0.5454	2.005	-22.3	1381.6	-0.096	6.057	1489.3	6.486	4596.1	6.839
-40	0.7177	1.552	0	1390.0	0	5.962	1498.6	6.387	1606.3	6.736
-35	0.9322	1.216	22.3	1397.9	0.095	5.872	1507.9	6.293	1616.3	6.639
-30	1.196	0.9633	44.7	1405.6	0.188	5.785	1417.0	6.203	1626.3	6.547
-28	1.317	0.8809	53.6	1408.5	0.224	5.751	1520.7	6.169	1630.3	6.512
-26	1.447	0.8058	62.6	1411.4	0.261	5.718	1524.3	6.135	1634.2	6.477
-24	1.588	0.7389	71.7	1414.3	0.297	5.686	1527.9	6.103	1638.2	6.444
-22	1.740	0.6783	80.8	1417.3	0.333	5.655	1531.4	6.071	1642.2	6.411
-20	1.902	0.6237	89.8	1420.0	0.368	5.623	1534.8	6.039	1646.0	6.379
-18	2.077	0.5743	98.8	1422.7	0.404	5.593	1538.2	6.008	1650.0	6.347
-16	2.265	0.5296	107.9	1425.3	0.440	5.563	1541.7	5.978	1653.8	6.316
-14	2.465	0.4890	117.0	1427.9	0.475	5.533	1545.1	5.948	1657.7	6.286
-12	2.680	0.4521	126.2	1430.5	0.510	5.504	1548.5	5.919	1661.5	6.256
-10	2.908	0.4185	135.4	1433.0	0.544	5.475	1551.7	5.891	1665.3	6.227
-8	3.153	0.3879	144.5	1435.3	0.579	5.447	1554.9	5.863	1669.0	6.199
-6	3.413	0.3599	153.6	1437.6	0.613	5.419	1558.2	5.836	1672.8	6.171
-4	3.691	0.3344	162.8	1439.9	0.647	5.392	1561.4	5.808	1676.4	6.143
-2	3.983	0.3110	172.0	1442.2	0.681	5.365	1564.6	5.782	1680.1	6.116
0	4.295	0.2895	181.2	1444.4	0.715	5.340	1567.8	5.756	1683.9	6.090
2	4.625	0.2699	190.4	1446.5	0.749	5.314	1570.9	5.731	1687.5	6.065
4	4.975	0.2517	199.7	1448.5	0.782	5.288	1574.0	5.706	1691.2	6.040
6	5.346	0.2351	209.1	1450.6	0.816	5.263	1577.0	5.682	1694.9	6.015
8	5.736	0.2198	218.5	1452.5	0.849	5.238	1580.1	5.658	1698.4	5.991
10	6.149	0.2056	227.8	1454.3	0.881	5.213	1583.1	5.634	1702.2	5.967
12	6.585	0.1926	237.2	1456.1	0.914	5.189	1586.0	5.611	1705.7	5.943
14	7.045	0.1805	246.6	1457.8	0.947	5.165	1588.9	5.588	1709.1	5.920
16	7.529	0.1693	256.0	1459.5	0.979	5.141	1591.7	5.565	1712.5	5.898
18	8.035	0.1590	265.5	1461.1	1.012	5.118	1594.4	5.543	1715.9	5.876
20	8.570	0.1494	275.1	1462.6	1.044	5.095	1597.2	5.521	1719.3	5.854
22	9.134	0.1405	284.6	1463.9	1.076	5.072	1600.0	5.499	1722.8	5.832
24	9.722	0.1322	294.1	1465.2	1.108	5.049	1602.7	5.478	1726.3	5.811
26	10.34	0.1245	303.7	1466.5	1.140	5.027	1605.3	4.458	1729.6	5.790
28	10.99	0.1173	313.4	1467.8	1.172	5.005	1608.0	5.437	1732.7	5.770
30	11.67	0.1106	323.1	1468.9	1.204	4.984	1610.5	5.417	1735.9	5.750
32	12.37	0.1044	332.8	1469.9	1.235	4.962	1613.0	5.397	1739.3	5.731
34	13.11	0.0986	342.5	1470.8	1.267	4.940	1615.4	5.378	1742.6	5.711
36	13.89	0.0931	352.3	1471.8	1.298	4.919	1617.8	5.358	1745.7	5.692
38	14.70	0.0880	362.1	1472.6	1.329	4.898	1620.1	5.340	1748.7	5.674
40	15.54	0.0833	371.9	1473.3	1.360	4.877	1622.4	5.321	1751.9	5.655
42	16.42	0.0788	381.8	1473.8	1.391	4.856	1624.6	5.302	1755.0	5.637
44	17.34	0.0746	391.8	1474.2	1.422	4.835	1626.8	5.284	1758.0	5.619
46	18.30	0.0706	401.8	1474.5	1.453	4.814	1629.0	5.266	1761.0	5.602
48	19.29	0.0670	411.9	1474.7	1.484	4.793	1631.1	5.248	1764.0	5.584
50	20.33	0.0635	421.9	1474.7	1.515	4.773	1633.1	5.230	1766.8	5.567

Ammonia Molecular weight : 17.03 g/mol
Ammonia Melting point : -78^oC
Ammonia Latent heat of fusion (1,013 bar, at triple point) : 331.37 kJ/kg
Ammonia Liquid Density (1.013 bar at boiling point) : 682 kg/m³ (250 K : 669 kg/m³) (300 K : 600 kg/m³) (400 K : 346 kg/m³)
Ammonia Liquid Specific Heat Capacity (c_p) (250 K : 4.52 kJ/kg.K) (300 K : 4.75 kJ/kg.K) (400 K : 6.91 kJ/kg.K)
Ammonia Liquid/gas equivalent (1.013 bar and 15^oC (59^oF)) : 947 vol/vol
Ammonia Liquid Dynamic Viscosity (250K : 245 10⁶ Ns/m²) (300K : 141 10⁶ Ns/m²) (400K : 38 10⁶ Ns/m²)
Ammonia Liquid Thermal Conductivity (250 K : 592 10⁶ kW/m.K) (300 K : 477 10⁶ kW/m.K) (400 K : 207 10⁶ kW/m.K)
Ammonia Boiling point (1.013 bar) : -33.5^oC
Ammonia Latent heat of vaporization (1.013 bar at boiling point) : 1371.2 kJ/kg
Ammonia Vapor pressure (at 21^oC or 70^oF) : 8.88 bar
Ammonia Critical point - Critical temperature : 132.4^oC - Critical pressure : 112.8 bar
Ammonia Gas Density (1.013 bar at boiling point) : 0.86 kg/m³
Ammonia Gas Density (1.013 bar and 15^oC (59^oF)) : 0.73 kg/m³
Ammonia Gas Compressibility Factor (Z) (the ratio of the actual volume of the gas to the volume determined according to the perfect gas law) (1.013 bar and 15^oC (59^oF)) : 0.9929
Ammonia Gas Specific Gravity (air = 1) (1.013 bar and 21^oC (70^oF)) : 0.597
Ammonia Gas Specific volume (1.013 bar and 21^oC (70^oF)) : 1.411 m³/kg
Ammonia Gas Specific Heat Capacity at constant pressure (c_p) (1.013 bar and 15^oC (59^oF)) : 0.037 kJ/(mol.K)
Ammonia Gas Specific Heat Capacity at constant volume (c_v) (1.013 bar and 15^oC (59^oF)) : 0.028 kJ/(mol.K)
Ammonia Gas Ratio of Specific Heats (Gamma:C_p/C_v) (1.013 bar and 15^oC (59^oF)) : 1.309623
Ammonia Gas Dynamic Viscosity (1.013 bar and 0^oC (32^oF)) : 0.000098 Poise
Ammonia Gas Thermal conductivity (1.013 bar and 0^oC (32^oF)) : 22.19 mW/(m.K)
Ammonia Gas Solubility in water (1.013 bar and 0^oC (32^oF)) : 862 vol/vol
Ammonia Gas Autoignition temperature : 630^oC

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