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glass electrode
An electrode for measuring the pH of a solution, based on the fact that a thin sheet of glass is permeable to hydrogen ions but not to other ions.

The device often contains both electrodes of a cell within it; that is, a reference electrode as well as the glass electrode proper, and a salt bridge for connecting them, so that the potential produced by the cell depends on the pH of the solution in which the appliance is immersed.

This entry is located in the following unit: electro-, electr-, electri- (page 92)