what is Col tar and cPal gas
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Coal tar is a thick dark liquid, which is a by_product of the production of coke and coal gas. It has both Medical and Industrial uses.
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Coal gas, gaseous mixture—mainly hydrogen, methane, and carbon monoxide—formed by the destructive distillation (i.e., heating in the absence of air) of bituminous coal and used as a fuel. ... Coal tar and coke (qq.v.) are obtained as by-products.
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