Butane and propane are just two of the family of hydrocarbon molecules that we use for fuel.
The different fuel gasses are all hydrocarbon molecules, the difference being the number of carbon and hydrogen atoms that are joined together.
Methane or natural gas - 1 carbon, 4 hydrogen atoms.
Ethane - 2 carbon, 6 hydrogen atoms.
Propane - 3 carbon, 8 hydrogen atoms.
Butane - 4 carbon, 10 hydrogen atoms.
Pentane - 5 carbon, 12 hydrogen atoms.
Hexane - 6 carbon, 14 hydrogen atoms.
You can just keep going from there adding one carbon and 2 hydrogen to keep getting different molecules.
As the molecules get larger their vapor pressure drops. Methane and ethane require extremely high pressures to turn them to liquid form at ambient temperatures. Propane boils at -42� F while butane boiling point is about 30� F.
Here is more information on this family of hydrocarbons.
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Today's Featured Article - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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