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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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