When methanol (CH3OH) is burned in the presence of oxygen (O2), it undergoes combustion and primarily produces two gases: carbon dioxide (CO2) and water vapor (H2O). The balanced chemical equation for the combustion of methanol is:

2CH3OH + 3O2 -> 2CO2 + 4H2O

During the combustion process, methanol reacts with oxygen to form carbon dioxide and water molecules. Carbon dioxide is a greenhouse gas, while water vapor is a natural component of the Earth's atmosphere. In addition to these two main products, small amounts of other gases and pollutants, such as carbon monoxide (CO), nitrogen oxides (NOx), and unburned hydrocarbons, may also be produced during incomplete combustion or under certain conditions.