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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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