Oxygen (R732) Thermodynamic properties

Saturation tables by temperature and by pressure, superheated vapor table, p–h and T–s diagrams and constants of Oxygen (O₂), computed with CoolProp. Any other state of Oxygen, from any two properties, in the State Explorer or the Worksheet.

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Constants

Formula: O₂
Also known as: oxygen, OXYGEN, O2, R732
CAS: 7782-44-7
Molar mass: 31.999 g/mol
Normal boiling point (1 atm): -182.96 °C (90.188 K)
Critical temperature: -118.55 °C (154.6 K)
Critical pressure: 5.0464 MPa
Critical density: 426.93 kg/m³
Triple point: -218.79 °C, 0.14628 kPa
Acentric factor: 0.0222
Valid up to: 1726.9 °C, 80 MPa

Saturation table

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

Saturated Oxygen, 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)
-210	1.5516	0.00078864	10.56	-178.91	235.92	57.009	2.3428	6.0787
-200	10.808	0.00081802	1.7477	-162.13	227.98	65.851	2.5894	5.706
-190	45.372	0.00085072	0.46771	-145.3	219.58	74.275	2.8046	5.4454
-180	136.66	0.00088784	0.17005	-128.3	210.09	81.789	2.9968	5.2522
-170	328.12	0.00093113	0.075581	-110.92	198.82	87.903	3.1723	5.0997
-160	671.11	0.00098342	0.038393	-92.86	185.03	92.17	3.3362	4.9715
-150	1221.6	0.0010497	0.021269	-73.729	167.77	94.038	3.4935	4.8558
-140	2039.3	0.0011403	0.012363	-52.815	145.35	92.534	3.6497	4.7413
-130	3191.5	0.0012849	0.0071877	-28.443	113.72	85.282	3.8159	4.6103
-120	4771	0.0016921	0.0034807	8.5333	50.656	59.19	4.0491	4.3799

Saturation table by pressure

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

Saturated Oxygen, 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)
1	-211.86	0.0007835	15.908	-182.04	237.38	55.341	2.2926	6.1659
2	-208.86	0.00079182	8.3369	-177.01	235.03	58.023	2.3727	6.0288
3	-206.96	0.00079726	5.7195	-173.81	233.53	59.723	2.4218	5.9497
5	-204.36	0.00080482	3.5621	-169.46	231.48	62.021	2.4862	5.8514
10	-200.47	0.00081658	1.8776	-162.92	228.36	65.444	2.5787	5.7205
20	-196.05	0.0008305	0.99195	-155.49	224.75	69.253	2.6777	5.5927
30	-193.18	0.00083991	0.68356	-150.66	222.33	71.669	2.7391	5.5193
50	-189.21	0.00085347	0.42787	-143.97	218.88	74.906	2.8205	5.4282
100	-183.09	0.00087581	0.22658	-133.58	213.18	79.597	2.9395	5.3065
200	-175.91	0.00090465	0.1197	-121.26	205.74	84.481	3.0702	5.1861
300	-171.13	0.00092587	0.082169	-112.9	200.2	87.299	3.1532	5.1154
500	-164.34	0.00095935	0.050856	-100.81	191.38	90.574	3.2661	5.025
1000	-153.53	0.0010242	0.026004	-80.637	174.34	93.699	3.4384	4.8958
2000	-140.41	0.0011359	0.012634	-53.716	146.4	92.683	3.6432	4.7461
3000	-131.45	0.0012578	0.0078013	-32.342	119.23	86.891	3.7902	4.6317

Diagrams

p–h diagram of Oxygen, with isotherms

T–s diagram of Oxygen, with isobars

Superheated vapor table

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

Superheated Oxygen at 50 kPa (Tsat -189.21 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.42787	53.513	74.906	5.4282
-180	0.47725	59.66	83.522	5.5256
-160	0.58319	72.783	101.94	5.7048
-140	0.68839	85.887	120.31	5.8542
-120	0.79317	98.956	138.62	5.9823
-100	0.89769	112	156.89	6.0945
-80	1.0021	125.04	175.14	6.1942
-60	1.1063	138.08	193.39	6.2841

Superheated Oxygen at 100 kPa (Tsat -183.09 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.22658	56.939	79.597	5.3065
-180	0.23508	59.043	82.552	5.3388
-160	0.28915	72.335	101.25	5.5207
-140	0.34241	85.548	119.79	5.6716
-120	0.39522	98.69	138.21	5.8005
-100	0.44778	111.79	156.57	5.9131
-80	0.50019	124.86	174.88	6.0132
-60	0.55249	137.92	193.17	6.1033

Superheated Oxygen at 200 kPa (Tsat -175.91 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.1197	60.542	84.481	5.1861
-160	0.14207	71.414	99.829	5.3323
-140	0.16939	84.861	118.74	5.4862
-120	0.19624	98.153	137.4	5.6168
-100	0.22283	111.35	155.91	5.7305
-80	0.24925	124.49	174.34	5.8312
-60	0.27558	137.6	192.71	5.9217

Superheated Oxygen at 500 kPa (Tsat -164.34 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.050856	65.146	90.574	5.025
-160	0.053595	68.398	95.195	5.0667
-140	0.065502	82.701	115.45	5.2317
-120	0.076821	96.497	134.91	5.3679
-100	0.087839	110.01	153.93	5.4846
-80	0.098686	123.37	172.71	5.5873
-60	0.10942	136.64	191.35	5.6791

Superheated Oxygen at 1 MPa (Tsat -153.53 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.026004	67.696	93.699	4.8958
-140	0.030703	78.71	109.41	5.0204
-120	0.036949	93.57	130.52	5.1683
-100	0.042817	107.7	150.52	5.291
-80	0.048486	121.46	169.95	5.3972
-60	0.054036	135.01	189.05	5.4913

Superheated Oxygen at 2 MPa (Tsat -140.41 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.012634	67.415	92.683	4.7461
-120	0.016863	86.913	120.64	4.9428
-100	0.020252	102.73	143.24	5.0816
-80	0.023368	117.46	164.2	5.1963
-60	0.026339	131.66	184.33	5.2955

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