Electrolysis is an electro-chemical process. Electrolysis uses direct electric current to drive an otherwise non-spontaneous chemical reaction. Electrolysis separates elements from ores using electrolytic cell. Electrolysis is then the chemical decomposition produced by passing an electric current through a liquid or solution containing ions. Electrolysis is used in production of aluminum, lithium, potassium, sodium, magnesium and calcium. Electrolysis is also used to produce chlorine and sodium hydroxide and electrolytic copper. Electrolysis is also used for the production of oxygen for spacecraft and nuclear submarines. Electrolysis is also used in the cleaning and preservation of old artifacts.