the percentage of o2 in air is 20.95 %.
what is the percentage of o2 in air?
20.95 %
if the stoichiometric combustion takes place using air as the oxygen source, the nitrogen present in the air (atmosphere of earth) can be added to the equation (although it does not react) to show the stoichiometric composition of the fuel in air and the composition of the resultant flue gas. note that treating all non-oxygen components in air as nitrogen gives a 'nitrogen' to oxygen ratio of 3.77, i.e. (100% - o2%) / o2% where o2% is 20.95% vol:





























where formula_3.





























for example, the stoichiometric combustion of propane (c3h8) in air is:
combustion
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