A CompoundChem.com (Ѻ) info graphic (Ѻ) of oxidation and reduction.
In chemistry, oxidation, as compared to reduction, is a reaction in which an element loses electrons.

The following are related quotes:

“We can no longer maintain the infinite past duration of the earth; for chemical forces as well as mechanical tend to equilibrium. If, for instance, a large portion of the earth’s mass were originally pure potassium, we can imagine violent igneous action to go on so long as any part remained unoxidized; but when the oxidation of the whole has taken place, this action must be at an end; for there is no agency (physical) which can reproduce the de-oxidized metal. Thus a perpetual motion is incapable in chemistry, as it is in mechanics; and a theory of constant change, continued through infinite time, is untenable.”
William Whewell (1883), Bridgewater Treatise, quoted by E.B. (1851) [1]

1. E.B. (1851). “Hard Hits by the Author of the Creed of Error” (“human chemistry” pg. 326), The Reasoner: and Theological Examiner, 10(228-259): 326-28.

External links
Oxidation – TheFreeDictionary.com.

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