Argon (R740) Thermodynamic properties

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

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Constants

Formula: Ar
Also known as: argon, ARGON, R740, Ar
CAS: 7440-37-1
Molar mass: 39.948 g/mol
Normal boiling point (1 atm): -185.85 °C (87.302 K)
Critical temperature: -122.46 °C (150.69 K)
Critical pressure: 4.863 MPa
Critical density: 535.6 kg/m³
Triple point: -189.34 °C, 68.892 kPa
Acentric factor: -0.00219
Valid up to: 1726.9 °C, 1000 MPa

Saturation table

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

Saturated Argon, 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)
-185	110.72	0.00071935	0.15968	-116.57	160.49	43.926	1.3858	3.2065
-180	180.32	0.000736	0.10199	-110.93	156.52	45.59	1.4475	3.1277
-175	278.76	0.0007541	0.068179	-105.2	152.18	46.971	1.5065	3.057
-170	412.48	0.00077392	0.047292	-99.371	147.39	48.023	1.5635	2.9924
-165	588.21	0.00079589	0.0338	-93.388	142.09	48.698	1.6188	2.9326
-160	812.87	0.00082051	0.024745	-87.216	136.15	48.935	1.673	2.8762
-155	1093.5	0.00084854	0.01846	-80.801	129.46	48.662	1.7264	2.8222
-150	1437.5	0.00088107	0.013965	-74.074	121.85	47.778	1.7797	2.7692
-145	1852.4	0.00091979	0.010659	-66.936	113.07	46.136	1.8335	2.7159
-140	2346.3	0.00096765	0.00816	-59.226	102.73	43.507	1.889	2.6605
-135	2928.4	0.0010304	0.0062113	-50.656	90.129	39.473	1.9478	2.6002
-130	3609.6	0.0011221	0.0046236	-40.593	73.715	33.123	2.0142	2.5291
-125	4405.5	0.0012988	0.0031847	-26.828	48.126	21.298	2.102	2.4268

Saturation table by pressure

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

Saturated Argon, 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)
70	-189.21	0.00070625	0.24305	-121.28	163.62	42.336	1.3313	3.2804
80	-188.03	0.00070985	0.21508	-119.96	162.76	42.798	1.3469	3.2589
100	-185.97	0.00071625	0.17531	-117.66	161.23	43.573	1.3734	3.2229
150	-181.96	0.00072933	0.12083	-113.14	158.11	44.971	1.4237	3.1575
200	-178.86	0.00074	0.092704	-109.63	155.56	45.932	1.4612	3.111
250	-176.3	0.00074923	0.075423	-106.7	153.34	46.641	1.4914	3.0747
300	-174.1	0.00075752	0.06368	-104.17	151.35	47.186	1.5169	3.045
400	-170.41	0.00077222	0.048675	-99.855	147.81	47.951	1.5589	2.9975
500	-167.35	0.00078527	0.039445	-96.219	144.65	48.432	1.593	2.9602
600	-164.71	0.00079725	0.033166	-93.031	141.76	48.725	1.622	2.9292
700	-162.37	0.00080849	0.028605	-90.164	139.05	48.882	1.6475	2.9026
800	-160.26	0.00081917	0.025133	-87.539	136.47	48.935	1.6702	2.8791
1000	-156.55	0.00083942	0.020183	-82.822	131.63	48.807	1.7099	2.8388
1500	-149.19	0.00088689	0.013358	-72.944	120.51	47.567	1.7884	2.7605
2000	-143.41	0.00093378	0.0097936	-64.564	109.99	45.424	1.8509	2.6987
2500	-138.6	0.00098335	0.0075677	-56.93	99.475	42.545	1.905	2.6443
3000	-134.44	0.0010389	0.0060175	-49.614	88.513	38.899	1.9548	2.5929
4000	-127.45	0.0011926	0.0038923	-34.368	62.619	28.251	2.0541	2.4839

Diagrams

p–h diagram of Argon, with isotherms

T–s diagram of Argon, with isobars

Superheated vapor table

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

Superheated Argon at 100 kPa (Tsat -185.97 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.17531	26.042	43.573	3.2229
-180	0.1885	28.067	46.917	3.26
-160	0.2318	34.635	57.815	3.366
-140	0.2744	41.051	68.491	3.4529
-120	0.31667	47.4	79.067	3.5269
-100	0.35875	53.715	89.59	3.5915
-80	0.40071	60.009	100.08	3.6489
-60	0.4426	66.291	110.55	3.7004

Superheated Argon at 200 kPa (Tsat -178.86 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.092704	27.391	45.932	3.111
-160	0.11399	33.93	56.729	3.2154
-140	0.13582	40.533	67.696	3.3047
-120	0.15728	46.993	78.449	3.38
-100	0.17855	53.38	89.091	3.4453
-80	0.19971	59.727	99.668	3.5031
-60	0.22078	66.047	110.2	3.555

Superheated Argon at 500 kPa (Tsat -167.35 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.039445	28.709	48.432	2.9602
-160	0.043144	31.629	53.201	3.0038
-140	0.052607	38.91	65.213	3.1017
-120	0.061627	45.739	76.552	3.181
-100	0.070427	52.361	87.574	3.2487
-80	0.079098	58.869	98.418	3.308
-60	0.087687	65.309	109.15	3.3609

Superheated Argon at 1 MPa (Tsat -156.55 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.020183	28.624	48.807	2.8388
-140	0.024753	35.926	60.679	2.9342
-120	0.029698	43.532	73.23	3.0221
-100	0.034367	50.603	84.97	3.0942
-80	0.038889	57.409	96.298	3.1561
-60	0.043322	64.06	107.38	3.2107

Superheated Argon at 2 MPa (Tsat -143.41 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.0097936	25.837	45.424	2.6987
-140	0.010463	28.191	49.118	2.7268
-120	0.01363	38.558	65.819	2.8441
-100	0.016301	46.84	79.441	2.9278
-80	0.018773	54.36	91.906	2.9959
-60	0.021138	61.492	103.77	3.0544

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