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fractional distillation

/ˈfræk·ʃə·nəl ˌdɪs·təlˈeɪ·ʃən/ n [U]

Definition

chemistry the process of separating parts of a liquid by heating it gradually so that different parts become gas, rise up, then turn back into liquid that can be collected as they cool
(Definition of fractional distillation n from the Cambridge Academic Content Dictionary © Cambridge University Press)

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