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''Decantation'' is a process for the separation of mixtures, by removing a layer of liquid, generally one from which a precipitate has settled. The purpose may be either to produce a clean decant, or to remove undesired liquid from the precipitate (or other layers). If the aim is to produce a clean solution, a small amount of solution must generally be left in the container, and care must be taken to prevent any precipitate from flowing with the solution out of the container. ==Preliminary processes== A mixture of an insoluble solid in liquid is allowed to stand. The solid is insoluble and settles at the bottom if kept undisturbed for some time. This process is called sedimentation. A centrifuge may be useful in decanting a solution. The centrifuge causes the precipitate to be forced to the bottom of the container; if the force is high enough, the precipitate may form a compact solid. Then the liquid can be more easily poured away, as the precipitate will tend to remain in its compressed form. Similarly a mixture of two immiscible liquids can also be separated by decantation. For example, the oil and water extracted from fish may be decanted to obtain the oil. A mixture of kerosene and water can also be separated through decantation 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Decantation」の詳細全文を読む スポンサード リンク
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