A separating funnel, also know as separation funnel, separatory funnel, or step funnel, is a laboratory glassware used in liquid extractions to separate (partition) the components of a mixture between two immiscible solvent phases of different densities. 

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A separating funnel, also know as separation funnel, separatory funnel, or step funnel, is a laboratory glassware used in liquid extractions to separate (partition) the components of a mixture between two immiscible solvent phases of different densities.