coal and gas for example
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coal
bituminous coal
linlgnite
coke
charcoal
krishnasingh10520327:
charcoal
yea
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It is produced when coal is heated strongly in the absence of air. ... Coal gas contains a variety of calorific gases including hydrogen, carbon monoxide, methane, ethylene and volatile hydrocarbons together with small quantities of non-calorific gases such as carbon dioxide and nitrogen.
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