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=== Chemistry === In chemistry, the vertical line is used in [[cell notation]] of electrochemical cells. Example, Zn | Zn<sup>2+</sup> || Cu<sup>2+</sup> | Cu Single vertical lines show components of the cell which do not mix, usually being in different phases. The double vertical line ( || ) is used to represent salt bridge; which is used to allow free moving ions to move.
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