Thus, minerals are subject to slow oxidation process which occurs at ambient temperature by consumption of oxygen from atmospheric air, with production of oxides in a state of maximum stability. In everyday life we encounter slow oxidation processes at every step. Heating the same mixture to a temperature of only 200☌, result in a slow oxidation process, which produces methanol, formic acid, formaldehyde, carbon monoxide and carbon dioxide gas, with an overall response rate with an evolution with measured values up to a maximum, after which rate value decreases with the depletion of reagents. This applies, for example, to the stoichiometric mixture of methane - oxygen heated to a temperature of 560☌ in a sealed container. Compared with slow oxidation processes, it is characteristic to the combustion process sudden acceleration of the reaction rate to achieve theoretically infinite values. The combustion process is a process of rapid oxidation, followed by light phenomena and the release of large amounts of energy, able to maintain it at high temperatures. Among human activities, those in which fuel combustion processes intervene are those who contaminate the atmosphere greatly.
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