Nitrogen (R728) Thermodynamic properties

Saturation tables by temperature and by pressure, superheated vapor table, p–h and T–s diagrams and constants of Nitrogen (N₂), computed with CoolProp. Any other state of Nitrogen, from any two properties, in the State Explorer or the Worksheet.

Calculate a state of Nitrogen Open it in the Worksheet

Constants

Formula: N₂
Also known as: nitrogen, NITROGEN, N2, R728
CAS: 7727-37-9
Molar mass: 28.013 g/mol
Normal boiling point (1 atm): -195.79 °C (77.355 K)
Critical temperature: -146.96 °C (126.19 K)
Critical pressure: 3.3958 MPa
Critical density: 313.3 kg/m³
Triple point: -210 °C, 12.52 kPa
Acentric factor: 0.0372
Valid up to: 1726.9 °C, 2200 MPa

Saturation table

By temperature: saturated liquid (f) and saturated vapor (g).

Saturated Nitrogen, by temperature
T °C	Psat kPa	vf m³/kg	vg m³/kg	hf kJ/kg	hfg kJ/kg	hg kJ/kg	sf kJ/(kg·K)	sg kJ/(kg·K)
-205	29.155	0.0011815	0.68163	-140.7	210.15	69.446	2.5783	5.6619
-200	59.842	0.0012123	0.35208	-130.59	204.4	73.801	2.7209	5.5151
-195	111.17	0.0012462	0.19904	-120.39	198.14	77.756	2.855	5.3904
-190	190.67	0.0012836	0.12071	-110.04	191.25	81.217	2.9821	5.2822
-185	306.6	0.0013254	0.077319	-99.485	183.57	84.083	3.1036	5.186
-180	467.67	0.0013729	0.051671	-88.663	174.9	86.238	3.2206	5.0982
-175	682.99	0.0014279	0.035662	-77.47	165.01	87.539	3.3345	5.0156
-170	961.98	0.0014932	0.025191	-65.767	153.55	87.787	3.4467	4.9353
-165	1314.6	0.0015738	0.01805	-53.336	140.02	86.682	3.5592	4.8539
-160	1751.6	0.0016791	0.012974	-39.805	123.49	83.688	3.6751	4.7665
-155	2285.4	0.0018314	0.009187	-24.398	102.07	77.674	3.8002	4.6641
-150	2932.9	0.0021133	0.0060798	-4.6079	69.62	65.012	3.9535	4.5188

Saturation table by pressure

By pressure: saturated liquid (f) and saturated vapor (g).

Saturated Nitrogen, by pressure
P kPa	Tsat °C	vf m³/kg	vg m³/kg	hf kJ/kg	hfg kJ/kg	hg kJ/kg	sf kJ/(kg·K)	sg kJ/(kg·K)
20	-207.33	0.001168	0.96376	-145.39	212.69	67.301	2.5084	5.74
30	-204.82	0.0011826	0.66396	-140.33	209.94	69.612	2.5837	5.656
50	-201.32	0.0012039	0.41529	-133.28	205.96	72.684	2.684	5.5515
100	-195.91	0.0012398	0.21947	-122.25	199.32	77.073	2.8312	5.4117
200	-189.52	0.0012873	0.11545	-109.04	190.56	81.517	2.9939	5.2726
300	-185.24	0.0013233	0.078925	-100	183.96	83.959	3.0978	5.1905
500	-179.15	0.0013816	0.048435	-86.801	173.32	86.523	3.24	5.084
1000	-169.4	0.0015019	0.024195	-64.327	152.06	87.734	3.4601	4.9257
2000	-157.55	0.0017454	0.010996	-32.574	113.81	81.236	3.7346	4.7191
3000	-149.53	0.0021576	0.005793	-2.2221	65.265	63.042	3.9717	4.4996

Diagrams

p–h diagram of Nitrogen, with isotherms

T–s diagram of Nitrogen, with isobars

Superheated vapor table

At each pressure, from its saturated vapor (Sat.) to higher temperatures.

Superheated Nitrogen at 20 kPa (Tsat -207.33 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.96376	48.026	67.301	5.74
-200	1.0751	53.58	75.081	5.8521
-180	1.3758	68.581	96.097	6.1061
-160	1.6746	83.497	116.99	6.3093
-140	1.9727	98.381	137.84	6.4789
-120	2.2703	113.25	158.66	6.6246
-100	2.5677	128.11	179.47	6.7523

Superheated Nitrogen at 50 kPa (Tsat -201.32 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.41529	51.919	72.684	5.5515
-180	0.54633	68.204	95.52	5.8301
-160	0.66712	83.234	116.59	6.035
-140	0.7871	98.181	137.54	6.2055
-120	0.90666	113.09	158.42	6.3516
-100	1.026	127.98	179.28	6.4796

Superheated Nitrogen at 100 kPa (Tsat -195.91 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.21947	55.126	77.073	5.4117
-180	0.26978	67.56	94.538	5.6174
-160	0.33126	82.79	115.92	5.8253
-140	0.39189	97.845	137.04	5.9972
-120	0.4521	112.82	158.03	6.1441
-100	0.51206	127.76	178.96	6.2726

Superheated Nitrogen at 200 kPa (Tsat -189.52 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.11545	58.426	81.517	5.2726
-180	0.13137	66.212	92.486	5.3969
-160	0.16329	81.883	114.54	5.6115
-140	0.19428	97.166	136.02	5.7864
-120	0.22482	112.28	157.25	5.9349
-100	0.2551	127.31	178.33	6.0643

Superheated Nitrogen at 500 kPa (Tsat -179.15 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.048435	62.305	86.523	5.084
-160	0.062369	78.985	110.17	5.3134
-140	0.075662	95.06	132.89	5.4984
-120	0.088431	110.63	154.84	5.6521
-100	0.10093	125.95	176.42	5.7845

Superheated Nitrogen at 1 MPa (Tsat -169.4 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.024195	63.539	87.734	4.9257
-160	0.028414	73.37	101.78	5.0555
-140	0.036037	91.29	127.33	5.2638
-120	0.042944	107.76	150.71	5.4275
-100	0.04953	123.64	173.17	5.5654

Superheated Nitrogen at 2 MPa (Tsat -157.55 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.010996	59.243	81.236	4.7191
-140	0.016008	82.423	114.44	4.9884
-120	0.02015	101.55	141.85	5.1806
-100	0.023827	118.79	166.44	5.3316

Enthalpy and entropy are measured from Nitrogen's own reference state (CoolProp's default). The textbooks' refrigerant tables use ASHRAE's: in the Worksheet, write reference ASHRAE.