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Physical Property
@ 15°C (60°F)
Butane
Normal
atmospheric state
Boiling point,
Initial, °C (°F)
End, °C (°F)
0 (32)
Heating value, Btu
/gal. (net, LHV*)
94670
/gal. (gross)
102032
3
/ft
(gas)
Density,
3
Ft
of gas/gal.
31.26
Wt./gal. liquid, lb.
Octane Number
Research
Motor
* Lower Heating Value
Figure 1 Engine Fuels, Physical Properties
Characteristic, LP Gas*
Formula
Boiling point, °C (°F)
Specific gravity of gas (air = 1.00)
Specific gravity of liquid (water = 1.00)
Btu/lb. of gas
3
Ft
of vapor at 16°C (60°F)/lb. of liquid at 16°C (60°F)
Latent heat of vaporization at boiling point, Btu/gal.
Combustion Data:
3
Ft
air required to burn 1 ft
Flash point, °C (°F)
Ignition temperature in air, °C (°F)
Max. flame temperature in air, °C (°F)
Limits of inflammability, percentage of gas in air
mixture:
At lower limit, %
At upper limit, %
Octane Number (ISO-Octane = 100)
* Commercial quality. Figures shown in this chart represent average values.
Figure 2 Additional LP Gas Characteristics
TP-6329 8/07
Propane
Gas
Gas
—
—
42 (--44 )
83340
91500
3264
2516
36.39
4.81
4.24
94
110+
90
97
3
of gas
Appendix B Fuel Physical Properties
Manufactured or
Sewage Gas
Natural Gas
Gas
Gas
—
—
--162 (--259)
—
63310
—
—
—
1000
600--700
57.75
—
2.65
—
110+
—
—
—
Butane
Propane
C
H
C
H
4
10
3
0 (32)
--42 (--44)
2.00
1.53
0.58
0.51
21221
21591
6.506
8.547
808.0
785.0
31.02
23.86
N/A
--104 (--156)
482--538
493--549
(900--1000)
(920--1020)
1991 (3615)
1979 (3595)
1.9
2.4
8.6
9.6
92
Over 100
Gasoline
Liquid
36 (97)
216 (420)
116400
124600
6390
19.5
6.16
80--100
75--90
8
Diesel Fuel
Liquid
177 (350)
357 (675)
130300
139000
—
—
7.08
—
—
Appendix 57
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