The LPG typically contains 90% Propane and less than 10% butane. The volume of gas expands to 270 times the volume of liquid in LPG. As a result, 1 liter of liquid propane expands to 270 liters of gaseous propane. LPG has an energy content of around 25MJ per liter. One gallon of propane has 91,547 BTU (60?F) of LPG energy.
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