chapter  1
64 Pages


Petroleum products are made from petroleum crude oil and natural gas, Similar products are made from other natural resources such as coal, peat, lignite, shale oil, and ta r sands. Products from these other sources are frequently called “synthetic,” even though their properties can be indistin­ guishable from crude oil derived products. Here the term “synthetic" is intended to denote the products came from a raw material other than the more common sources, crude oil or natural gas.