Isopentane (R601a) Thermodynamic properties

Saturation tables by temperature and by pressure, superheated vapor table, p–h and T–s diagrams and constants of Isopentane (C₅H₁₂), computed with CoolProp. Any other state of Isopentane, from any two properties, in the State Explorer or the Worksheet.

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Constants

Formula: C₅H₁₂
Also known as: ipentane, R601a, ISOPENTANE, IPENTANE
CAS: 78-78-4
Molar mass: 72.149 g/mol
Normal boiling point (1 atm): 27.826 °C (300.98 K)
Critical temperature: 187.2 °C (460.35 K)
Critical pressure: 3.3782 MPa
Critical density: 236 kg/m³
Triple point: -160.5 °C, 0.00000008949 kPa
Acentric factor: 0.2274
Valid up to: 226.85 °C, 1000 MPa

Saturation table

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

Saturated Isopentane, 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)
-150	0.0000020602	0.0012845	6888200	-343.05	472.27	129.22	-1.6862	2.1487
-125	0.00049968	0.0013252	34167	-299.87	450.55	150.68	-1.367	1.6742
-100	0.020871	0.0013669	955.98	-256.1	431.4	175.3	-1.0941	1.3974
-75	0.30281	0.0014105	75.365	-210.89	413.84	202.96	-0.85026	1.2383
-50	2.2236	0.001457	11.534	-163.68	397.15	233.47	-0.626	1.1537
-25	10.3	0.0015074	2.7526	-114.08	380.65	266.57	-0.41548	1.1185
0	34.543	0.0015632	0.89249	-61.77	363.66	301.89	-0.21487	1.1165
25	91.795	0.0016261	0.3589	-6.4556	345.45	339	-0.021498	1.1372
50	205.51	0.0016989	0.16813	52.166	325.25	377.42	0.16663	1.1731
75	404.57	0.0017858	0.087719	114.45	302.13	416.57	0.35117	1.219
100	722.14	0.0018942	0.049238	180.87	274.78	455.65	0.53373	1.2701
125	1195.5	0.0020384	0.028833	252.2	241.08	493.28	0.71627	1.3218
150	1868	0.0022535	0.016969	330.02	196.63	526.64	0.90222	1.3669
175	2798.2	0.0026813	0.0091788	419.59	126.72	546.31	1.1025	1.3852

Saturation table by pressure

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

Saturated Isopentane, 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	-60.861	0.0014364	24.428	-184.46	404.34	219.88	-0.72146	1.1832
2	-51.515	0.0014541	12.738	-166.6	398.15	231.55	-0.63915	1.1573
3	-45.585	0.0014656	8.7116	-155.1	394.24	239.14	-0.58795	1.1445
5	-37.562	0.0014815	5.4026	-139.32	388.96	249.64	-0.51981	1.1312
10	-25.545	0.0015063	2.8295	-115.19	381.01	265.83	-0.41995	1.1188
20	-11.988	0.0015357	1.4839	-87.209	371.91	284.7	-0.31001	1.1141
30	-3.215	0.0015556	1.0176	-68.658	365.9	297.24	-0.24021	1.1153
50	8.872	0.0015846	0.63258	-42.499	357.38	314.88	-0.14553	1.1217
100	27.446	0.0016327	0.33127	-0.87082	343.58	342.71	-0.002888	1.1401
200	49.079	0.001696	0.17252	49.945	326.04	375.99	0.15977	1.1716
300	63.453	0.0017436	0.11717	85.2	313.24	398.44	0.26628	1.1969
500	83.714	0.0018206	0.071246	137.1	293.16	430.26	0.41494	1.2364
1000	115.77	0.0019795	0.03503	225.22	254.46	479.68	0.64871	1.303
2000	154.07	0.0023008	0.015509	343.52	187.74	531.26	0.93328	1.3727
3000	179.5	0.0028367	0.0079227	438.81	106.5	545.31	1.1439	1.3792

Diagrams

p–h diagram of Isopentane, with isotherms

T–s diagram of Isopentane, with isobars

Superheated vapor table

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

Superheated Isopentane at 20 kPa (Tsat -11.988 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	1.4839	255.03	284.7	1.1141
0	1.5553	271.77	302.87	1.1821
20	1.6736	301.17	334.65	1.2943
40	1.7912	332.43	368.26	1.4052
60	1.9083	365.55	403.71	1.5149
80	2.025	400.51	441.01	1.6236
100	2.1414	437.31	480.14	1.7313
120	2.2576	475.92	521.07	1.8382
140	2.3737	516.31	563.79	1.9441
160	2.4896	558.46	608.25	2.0492
180	2.6055	602.31	654.42	2.1534
200	2.7212	647.84	702.27	2.2567
220	2.8369	695.01	751.75	2.3591

Superheated Isopentane at 50 kPa (Tsat 8.872 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.63258	283.25	314.88	1.1217
20	0.6599	299.99	332.98	1.1846
40	0.70842	331.46	366.88	1.2964
60	0.75639	364.73	402.55	1.4068
80	0.80398	399.81	440.01	1.516
100	0.85128	436.7	479.27	1.6241
120	0.89838	475.39	520.31	1.7312
140	0.94531	515.84	563.11	1.8374
160	0.99212	558.03	607.64	1.9426
180	1.0388	601.93	653.87	2.047
200	1.0855	647.49	701.77	2.1504
220	1.132	694.69	751.29	2.2529

Superheated Isopentane at 100 kPa (Tsat 27.446 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.33127	309.58	342.71	1.1401
40	0.34728	329.77	364.5	1.2111
60	0.37229	363.33	400.56	1.3227
80	0.39689	398.62	438.31	1.4327
100	0.42118	435.68	477.8	1.5415
120	0.44525	474.49	519.01	1.6491
140	0.46915	515.04	561.96	1.7556
160	0.49292	557.32	606.61	1.8611
180	0.51659	601.28	652.94	1.9657
200	0.54018	646.91	700.92	2.0693
220	0.56369	694.15	750.52	2.1719

Superheated Isopentane at 200 kPa (Tsat 49.079 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.17252	341.48	375.99	1.1716
60	0.17994	360.36	396.35	1.2337
80	0.19315	396.14	434.77	1.3457
100	0.206	433.55	474.75	1.4558
120	0.2186	472.64	516.36	1.5644
140	0.23101	513.41	559.61	1.6717
160	0.24328	555.86	604.52	1.7779
180	0.25544	599.97	651.06	1.8829
200	0.26751	645.71	699.22	1.9869
220	0.27951	693.06	748.96	2.0898

Superheated Isopentane at 500 kPa (Tsat 83.714 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.071246	394.63	430.26	1.2364
100	0.076346	426.43	464.6	1.3305
120	0.082246	466.6	507.72	1.4431
140	0.087878	508.17	552.11	1.5532
160	0.093323	551.25	597.91	1.6614
180	0.098629	595.85	645.17	1.7681
200	0.10383	642	693.91	1.8733
220	0.10895	689.67	744.15	1.9773

Superheated Isopentane at 1 MPa (Tsat 115.77 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.03503	444.65	479.68	1.303
120	0.035892	453.93	489.82	1.3289
140	0.039622	497.85	537.47	1.4471
160	0.042986	542.48	585.47	1.5606
180	0.046126	588.23	634.36	1.6709
200	0.049113	635.25	684.36	1.7789
220	0.051989	683.62	735.61	1.885

Superheated Isopentane at 2 MPa (Tsat 154.07 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.015509	500.25	531.26	1.3727
160	0.016517	516.59	549.63	1.4154
180	0.01919	568.38	606.76	1.5444
200	0.021351	618.82	661.53	1.6627
220	0.023261	669.5	716.02	1.7755

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