Commercial natural gas has an energy content of about 1000 Btu per cubic foot while vaporized propane has an energy content of about 2500 Btu per cubic foot. Both come from natural gas. During processing, the heavier (and higher Btu content) molecules are stripped out of the gas that comes from the gas wells and sold separately at higher prices. What remains (mostly methane) is sold as natural gas.
The decision of how much of the heavier molecules are removed from the gas stream is an economic one. The processors of the gas will make little effort to strip the heavier molecules from the gas unless they can make more profit by doing so.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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