Coal products are a range of products derived from coal. These products include coke, coal tar, coal gas, and other by-products of coal processing. Coke is a solid fuel made from heating coal in the absence of air. Coal tar is a thick, black liquid produced during the production of coke. Coal gas is a mixture of gases produced during the production of coke. Other by-products of coal processing include coal-tar pitch, coal-tar creosote, and coal-tar naphtha.