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A salt bridge is an inverted u-shaped tube that contains an electrolyte and allows the two half cells to be connected so ions can flow freely and the charge between the half cells remains balanced. A porous disk allows cation/anion flow as well but takes the form of a disk in between the two solutions. With a porous disk the half cells aren't in two completely separate containers, unlike when the half cells are connected by a salt bridge. Salt bridges are denoted by two vertical lines whereas porous disks are denoted by one vertical line (although usually two vertical lines or a single vertical dotted line are accepted as well). Basically if the solutions are in two separate containers there is a salt bridge but if the solutions are in the same container they are separated by a porous disk.
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