15.08.2013 - What's in crude oil and how do we use It?
Crude oil is far from being one homogenous substance. Its physical characteristics differ depending on where in the world it's pulled out of the ground, and those variations determine its usage and price. The Energy Information Administration (EIA) puts it succinctly: "not all crude is created equal." Some has a lot of sulphur, and it's called sour. Oil with less sulphur is called sweet. Crudes also vary in how dense they are. Sweet, light crude is the most valuable type of oil. Sour, heavy oil fetches the lowest prices. Here's why:..............................................Full Article: Source
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