Petroleum
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Petroleum (L. petroleum < Gr. πετρέλαιον lit. "rock oil" was first used in the treatise De re metallica published in 1556 by the German mineralogist Georg Bauer, known as Georgius Agricola.) is a naturally occurring, flammable liquid found in rock formations in the Earth consisting of a complex mixture of hydrocarbon of various molecular weights, plus other organic compound.
The proportion of hydrocarbons in the mixture is highly variable and ranges from as much as 97% by weight in the lighter...
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