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Electrolysis is a process in which an electric current is passed through a substance, causing a chemical change. In electrolysis, a power supply (such as a battery or power source) is connected to two electrodes immersed in the substance. The substance can be a solution, a molten compound, or a gas. When the power supply is turned on, an electric current flows through the substance. The current causes the substance to decompose into its constituent elements or ions. Electrolysis is used in a variety of industrial processes, including the production of metals, chlorine, and hydrogen.