Crude oil is a mixture of hydrocarbons with different lengths., The crude oil is heated by passing it in pipes through a furnace., The fractions with long chains condense at the bottom of the tower at higher temperatures.., The fractions with medium length chains condense halfway up at the tower at moderate temperatures., The fractions with shorts chains condense higher up the tower at lower temperatures., These different factions can then be used for different tasks depending on their properties..

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