EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
A molecular model of propane, a flammable gas that is the byproduct of natural gas processing and petroleum refining that can be compressed into a liquid form. It is most commonly used for engine fuel, gas stoves or central heating in homes. Since it is an odourless gas, propane products will often contain an odorant so that people can distinguish any smell that might indicate a leak.
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