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Petroluem does not consist of a single substance but is a mixture of many substances - mostly several different hydrocarbons. These are separated by a process called fractional distillation. These different components are called fractions.

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Q: What do you mean by a fraction of petroleum?
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Did crude oil means petroleum?

Petroleum is refined from crude oil and is but one fraction only


What is the first fraction to sepatate out of petroleium?

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What fraction of the petroleum used by the United States is imported from other countrise?

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Kinds of machinery's on a ship using petroleum?

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