Liquefied petroleum gas ("LPG") is a fossil fuel obtained during oil and natural gas production and refining. Two thirds of the LPG people use is extracted directly from the earth. The rest is manufactured indirectly in the crude oil refining process. Chemically LPG is a mixture of two flammable but non toxic gases called propane and butane. When transported in the US via pipeline the more general term NGLs 'natural gas liquids' is also frequently used.
Americans are probably most familiar with LPG as a "Propane" tank they attach to their barbeque or RV. If