Oxidation occurs when a substance is combined with oxygen.
Oxidation is the process by which a substance combines with oxygen. It also involves the increment in the oxidation number of a substance. Oxidation reaction may occur quickly or slowly depending on the conditions of the reaction.
The oxidation that occurs in the statue of liberty is the same as that which occurs during flammability because in both processes, substances combine with oxygen.
However, the activation energy for the oxidation of copper is high. As such, when left to itself the reaction occurs slowly as we can see in the oxidation of the statue of liberty.
During flammability, energy is supplied in form of heat hence the reaction occurs faster and the oxide is formed.
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