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About Propane




Physical Properties of Propane, Butane & Natural Gas (Methane)

Propane Butane Natural Gas (Methane)
Chemical Formula C3H8 C4H10 CH4
Specific Gravity (Liquid) 0.504 0.582 0.300
Specific Gravity (Vapor) 1.500 2.010 0.550
Specific Weight (lbs/gal) 4.20 lbs/gal 4.81 lbs/gal -
Boiling Point - Atmospheric (deg F) -44 deg F 31 deg F -258 deg F
Ignition Temperature (deg F) 920 to 1120 900 to 1000 1150
Maximum Flame Temperature (deg F) 3,595 F 3,615 F 3,400 F
Upper Flammability Limit 9.60% 8.60% 15.00%
Lower Flammability Limit 2.15% 1.55% 5.00%
Ideal Combustion Ratio (Air to Gas) 24 to 1 31 to 1 10 to 1
Heat Value per Cu. Ft. - Vapor (Btu) 2,488 Btu 3,280 Btu 1,000 Btu
Heat Value per lb - Liquid (Btu) 21,548 Btu 21,221 Btu -
Heat Value per gallon - Liquid (Btu) 91,502 Btu 102,032 Btu -
Cubic Feet Vapor per gallon 36.38 Cu. Ft 31.26 Cu. Ft -
Cubic Feet Vapor per lb 8.66 Cu. Ft 6.51 Cu. Ft -
Latent Heat of Vaporization at Boiling Point
Per Pound (Btu) 184 Btu 167 Btu -
Per Gallon (Btu) 773 Btu 808 Btu -

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