Approximate Properties of LP-Gases (Commercial Propane)
Chemical formula	C3H8
Molecular weight	44.094
Initial Boiling point at 14.7 psia, degrees F	-44.0
Specific heat of liquid, Btu/lb. at 60  degrees F	4.20
Specific gravity, liquid at 60 degrees F	0.504
Specific gravity, vapor at 60 degrees F	1.5
Cubic ft. of vapor per gallon at 60  degrees F	36.38
Cubic ft. of vapor per pound at 60 degrees F	8.66
Weight per gallon of liquid at 60 degrees F	4.2 pounds
Ignition temperature	920 – 1,120 degrees F
Maximum flame temperature in air	3,595 degrees Fahrenheit
Flammability Limits in air (percent of vapor in air-gas mixture	Lower: 2.15 Upper: 9.6
Heat value per cubic foot of vapor	2,516 Btu
Heat value per pound of liquid	21,591 Btu
Heat value per gallon of liquid	91,547 Btu
Latent heat of vaporization at boiling point	Btu per pound:  184 Btu per gallon:  773
Total heating values after vaporization	Btu per cubic foot:  2,488 Btu per pound:  21,548 Btu Per gallon:  91,502
Vapor pressure in psig	70 degrees F:  127 100 degrees F:  196 105 degrees F:  210 130 degrees F:  287