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Isobutane
CH(CH3)3 |
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| Isobutane is a colorless, flammable gas. It is
shipped as a liquefied gas under it's own vapor pressure of approximately 30.7 psig @
70°F. Typically used in the manufacture of aviation fuels and as a calibration gas for
temperature and pressure gauges. |
| PHYSICAL CONSTANTS
CAS # 75-28-5 |
| Molecular Weight: |
58.124 |
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Latent Heat of Fusion @
m.p., cal/g |
18.67 |
| Vapor Pressure @ 70º
F, psig |
30.7 |
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Flammable Limits in
Air, :by volume % |
1.8-8.4 |
| Specific Volume @ 70º F., 1
atm.,cu.ft/lb |
6.5 |
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Autoignition
Temperature, ºF |
1010 |
| Boiling Point @ 1.0 atm.,ºF |
10.9 |
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Gross Heat of Combustion @
60º F., 1 atm.BTU/ft3 |
3352.15 |
| Freezing Point @ 1 atm.,
ºF |
-255.3 |
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Specific Heat, Liquid @ 60º
F., 1 atm. Cp,
cal/(g)(ºC) |
0.5695 |
| Specific Gravity, Gas @ 60º
F., 1 atm. (Air = 1): |
2.01 |
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Specific Heat, Gas @ 60º F.,
1 atm. Cp,
cal/(g)(ºC) |
0.3872 |
| Density, Liquid @ 60º F., 1
atm.,g/ml |
0.563 |
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Specific Heat, Gas @ 60º F.,
1 atm. Cv, cal/(g)(ºC) |
0.3530 |
| Critical
Temperature, ºF |
275.0 |
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Specific Heat Ratio, Gas @
60º F., 1 atm., Cp/Cv: |
1.097 |
| Critical
Pressure, psia |
529.2 |
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Thermal Conductivity, Gas @
0º C., BTU/hr ft2 ºF/ft |
0.01169 |
| Critical
Density, g/ml |
0.221 |
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Viscosity, Gas @ 23ºC., 1
atm. , centipoise |
0.00755 |
| Latent Heat of Vaporization @
b.p., cal/g |
87.56 |
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Surface Tension @ -20ºC., 1
atm., dynes/cm |
15.28 |
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Solubility in Water @ 17º C.,
1 atm., ml/ 100 ml |
1.7 |
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Last edited on:
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July 06, 2006
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