What is the ratio is the specific air fule ratio for combustionthe ratio is the specific air-fuel ratio (by weight) of atmospheric air to fuel at which the most efficient and complete combustion occurs

stoichiometric

Explanation:

In a combustion process air and fuel is needed. The ratio of air and fuel during a combustion process is called air-fuel ratio. If the ratio of air and fuel is such that the fuel is completely burned it is known as  the stoichiometric ratio.

If the ratio is lower than this ratio it is known as a rich mixture and lean mixture vice-versa.

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