chem

What happens during the intake stroke of a four-stroke internal combustion engine?

A. The piston moves downward, creating a partial vacuum that draws in air and fuel.
B. The piston moves downward as a result of the air/fuel mixture doing work on it.
C. The piston moves upward, compressing the air/fuel mixture and raising its temperature.
D. The piston moves upward, doing work on the air/fuel mixture to push it out of the cylinder.

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1. https://en.wikipedia.org/wiki/Four-stroke_engine

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2. A. The piston moves downward, creating a partial vacuum that draws in air and fuel.

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