Coal however, is not a Hydrocarbon. Coal is almost pure Carbon. If there are hydrocarbons present then these would be considered as impurities within the coal. Thus, you would expect a core sample of Coal to have a very low percentage of Hydrocarbons. Therefore the results in the table with 2% or less COS are excellent values to have. It means there is Coal with few impurities. The lower the percentage of hydrocarbons, the higher the grade of Coal.
Now he is applying the 2% COS figure to coal. Apparently the fool doesn't understand the difference between coal and oil!!!
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