volatile chemical / oil refinery works / petroleum product / oil hold / oil molecules / electricity / real crude oil / transportation / chemical impurities / chemical attack / gas find / gas molecules / crude oil inlet / overall energy / crude oil / petroleum products / kinetic energy / chemical evolution / chemical properties / chemical industry / overall electrostatic potential energy / oil molecules stay / heating oil / rotten egg gas / organic chemicals / less dense oil floats / biological systems / petroleum gas / natural gas / non-toxic gas / cold lubricating oil / salad oil / oil refinery / thermal energy / last major product / propane gas / hydrogen gas / oil / hot crude oil / chemical structure / gooey crude oil / chemical tasks / finished petroleum products / chemicals / energy reduction / hot oil / metal salts / removed gas / oil pressure / food / energy / /
Section 17.1 Oil Refineries Petroleum is one of our most versatile natural resources. In the past century and a half, petroleum has developed from a replacement for animal and vegetable oils in lighting and lubrication i