Equivalence Ratio
Equivalence Ratio : Fuel/Air mass ratio divided by the fuel/air mass ratio required for a stoichiometric mixture. NOTE 1 Standard, dry air contains 20. 95 % oxygen by volume. In practice, the oxygen concentration in entrained air may vary and calculation of the equivalence ratio to a standard, dry air basis will be required. NOTE 2 For gaseous fuels, an alternative expression of the equivalence ratio can be based on the fuel/air volume ratio. NOTE 3 It is dimensionless. See also: fuel lean combustion, fuel rich combustion, stoichiometric combustion, and stoichiometric mixture
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