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COALIFICATION is a dehydrogenation process with a reaction rate slower by many orders of magnitude than that of CARBONIZATION. Some specific reactions approach completion before others have started. The dehydrogenation remains incomplete. The degree of COALIFICATION reached by an organic material in the process of COALIFICATION increases progressively and can be defined by means of the measured C/H ratio and of the residual contents of oxygen, sulfur, and nitrogen.

See: CARBONIZATION.