What is it called when there is too much fuel in a fuel/air mixture?

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Multiple Choice

What is it called when there is too much fuel in a fuel/air mixture?

Explanation:
When there is too much fuel for the available oxygen, the mixture is considered rich. In a fuel/air mix, the air supplies the oxygen, so an excess of fuel means not all of it can burn, leading to incomplete combustion. This usually produces a smoky flame and more unburned hydrocarbons and carbon monoxide. The opposite situation is too lean (not enough fuel), and the balanced, ideal point is the stoichiometric ratio, where fuel and oxygen would completely react. Normal isn’t a standard term for this concept, so “rich” best captures the idea of excess fuel.

When there is too much fuel for the available oxygen, the mixture is considered rich. In a fuel/air mix, the air supplies the oxygen, so an excess of fuel means not all of it can burn, leading to incomplete combustion. This usually produces a smoky flame and more unburned hydrocarbons and carbon monoxide. The opposite situation is too lean (not enough fuel), and the balanced, ideal point is the stoichiometric ratio, where fuel and oxygen would completely react. Normal isn’t a standard term for this concept, so “rich” best captures the idea of excess fuel.

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