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Anything which burns in the presence of ______ is known as combustion.

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in Automotive Engine Design by (137k points)
Anything which burns in the presence of ______ is known as combustion.

(a) water

(b) fuel

(c) air

(d) salt

This question was posed to me in homework.

This intriguing question comes from Internal Combustion Engine in division Design of IC Engine Components of Automotive Engine Design

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The correct answer is (c) air

The best explanation: Fuel(solid, liquid or gas) always need oxygen to get combusted and the air is the only source for the availability of oxygen. Hence, anything which burns in the presence of air is known as combustion.

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