Which physical property makes it possible to separated the components of crude oil by means of distillation

As it turns out, the main factor is the boiling point. Oil is purified by the process of fractional distillation, or repeatedly attempting to remove impurities by increasing the intensity of the removal process. By analyzing a sample and repeatedly attempting to “evaporate” it, the sample will slowly become more concentrated with complex hydrocarbons, which are better for industrial production because of their energetic capacity. Less complex HC’s will be filtered out at lower boiling points.

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True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"