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RE: Only Gases Make Heat When Burned
yup..because it's the product of incomplete combustion
When combustion of carbon is incomplete, i.e. there is a limited supply of air, only half as much oxygen adds to the carbon, and instead you form carbon monoxide
.....and since the carbon is not yet fully oxidized.....In the presence of oxygen, including atmospheric concentrations, carbon monoxide burns with a blue flame, producing carbon dioxide