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Enthalpies and Entropies are referred to saturated liquid at -200 °F where the values are zero.
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Methane |
Ethene |
Ethane |
Propene |
Propane |
Iso-Butane |
N-Butane |
Air |
Water |
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Formula |
CH4 |
C2H4 |
C2H6 |
C3H6 |
C3H8 |
C4H10 |
C4H10 |
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H2O |
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| Vapor Pressure @ 100 °F |
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| PSIG (gauge) |
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..... |
..... |
..... |
212.5 |
174.8 |
58.8 |
37.3 |
..... |
..... |
| PSIA (absolute) |
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..... |
..... |
..... |
227.2 |
189.5 |
73.5 |
52 |
..... |
0.95 |
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| Normal State @ STP (*) |
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GAS |
GAS |
GAS |
GAS |
GAS |
GAS |
GAS |
GAS |
LIQUID |
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| Boiling Point of Liquid @ atmospheric pressure |
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| °F |
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-258.5 |
-154.7 |
-128.2 |
-53.9 |
-43.8 |
10.9 |
31.1 |
-317.7 |
212 |
| °C |
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-161.4 |
-103.7 |
-89 |
-47.7 |
-42.1 |
-11.7 |
-0.5 |
-194.3 |
100 |
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| Weight of Liquid @ 60 °F |
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| Pounds / gallon |
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2.5 |
3.3 |
3.11 |
4.35 |
4.23 |
4.69 |
4.86 |
7.136 |
8.337 |
| Specific Gravity |
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0.3 |
..... |
0.374 |
0.5218 |
0.508 |
0.563 |
0.584 |
0.856 |
1 |
| API Gravity |
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340 |
..... |
247 |
139.7 |
147 |
119.8 |
110.8 |
165.3 |
10 |
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| Cubic Feet of Vapor @ STP formed from |
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| 1 Gallon Liquid @ 60°F |
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59 |
44.6 |
39.35 |
37.9 |
36.45 |
30.65 |
31.79 |
..... |
..... |
| 1 Pound Liquid |
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23.6 |
13.21 |
12.65 |
8.71 |
8.62 |
6.53 |
6.54 |
..... |
..... |
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| Weight of Vapor @ STP |
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| Pounds / hundred cubic foot |
4.227 |
7.393 |
7.923 |
11.09 |
11.62 |
15.31 |
15.31 |
7.64 |
..... |
| Specific Gravity (Air=1) |
0.554 |
0.9684 |
1.038 |
1.4527 |
1.522 |
2.006 |
2.006 |
1 |
..... |
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| Gross Heat of Combustion |
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| Btu / pound |
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23,920 |
21,650 |
22,350 |
21,060 |
21,690 |
21,290 |
21,340 |
..... |
..... |
| Btu / cubic foot @ 60°F |
1,011 |
1,601 |
1,771 |
2,335 |
2,521 |
3,259 |
3,267 |
..... |
..... |
| Btu / gallon @ 60°F |
..... |
70,910 |
68,900 |
87,740 |
91,300 |
99,300 |
103,000 |
..... |
..... |
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| Cf of Air to Burn 1 cf of Gas @ STP |
9.55 |
14.29 |
16.71 |
21.44 |
23.87 |
31.03 |
31.03 |
..... |
..... |
| Pounds of Air to Burn 1 pound of Gas |
17.24 |
14.76 |
16.13 |
14.76 |
15.71 |
15.49 |
15.49 |
..... |
..... |
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| Explosive Limits |
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| Lower % in Air |
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4.9 - 6.2 |
2.75 |
3.0 - 3.3 |
2 |
2.0 - 2.4 |
1.8 |
1.5 - 1.9 |
..... |
..... |
| Upper % in Air |
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12.7 - 16.0 |
28.6 |
10.6 - 15.0 |
11 |
7.0 - 9.5 |
8.44 |
5.7 - 8.5 |
..... |
..... |
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| Heat of Vaporization of Liquid @ boiling |
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| point & atmospheric pressure |
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| Btu / pound |
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245 |
208 |
211 |
189 |
183 |
158 |
166 |
92 |
970.3 |
| Btu / gallon |
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712 |
686 |
696 |
822 |
774 |
741 |
797 |
656.5 |
8089.4 |
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| Ratio of Liquid Volume @ 60 °F to |
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| Gas Volume @ STP |
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443 |
333.7 |
294.3 |
283.5 |
272.7 |
229.3 |
237.8 |
..... |
..... |
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| Freezing Point of Liquid @ atmospheric pressure |
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| °F |
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-296.5 |
-272.6 |
-297.8 |
-301.4 |
-305.9 |
-255.3 |
-216.9 |
..... |
32 |
| °C |
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-182.5 |
-169.2 |
-183.2 |
-185.2 |
-187.7 |
-159.4 |
-138.3 |
..... |
0 |
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| Molecular Weight |
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16.042 |
28.052 |
30.068 |
42.079 |
44.094 |
58.12 |
58.12 |
28.966 |
18.016 |
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| Gallons / pound mol @ 60 °F |
6.4 |
8.5 |
9.64 |
9.7 |
10.41 |
12.38 |
11.94 |
4.06 |
2.16 |
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| Specific Heat @ STP |
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| Cp Liquid - Btu / pound /°F |
..... |
..... |
..... |
..... |
..... |
..... |
.55@32°F |
..... |
..... |
| Cp Vapor - Btu / pound /°F |
0.526 |
0.362 |
0.413 |
0.352 |
0.39 |
0.406 |
0.396 |
..... |
..... |
| Cv Vapor - Btu / pound /°F |
0.402 |
0.288 |
0.347 |
0.298 |
0.346 |
0.373 |
0.363 |
..... |
..... |
| Cp/Cv Vapor - Btu / pound /°F |
1.306 |
1.258 |
1.189 |
1.18 |
1.128 |
1.088 |
1.09 |
..... |
..... |
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| Critical Conditions |
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| Temperature - °F |
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-116.5 |
49.8 |
90.1 |
196.5 |
206.2 |
273.2 |
305.6 |
-221.3 |
705 |
| Temperature - °C |
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-82.5 |
9.9 |
32.3 |
91.4 |
96.8 |
134 |
152 |
-140.7 |
374.1 |
| Pressure - PSIA |
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673 |
742 |
708 |
667 |
617 |
530 |
551 |
547 |
3206 |
| Pressure - atmospheres |
45.8 |
50.5 |
48.2 |
45.4 |
42 |
36.1 |
37.5 |
37.2 |
218.2 |
| Density - pounds / gallon |
1.351 |
..... |
1.695 |
..... |
1.888 |
1.946 |
1.891 |
..... |
..... |
| Volume - cubic feet / pound mol |
1.586 |
..... |
2.371 |
..... |
3.123 |
3.99 |
4.13 |
..... |
..... |
* STP = Standard Temperature & Pressure Conditions = 60°F & atmospheric pressure.
Based on material from Handbook Butane-Propane Gases , Third Edition, 1951, Jenkins Publications, Inc.
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