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As a piston moves down in a cylinder, the volume inside the cylinder increases, which causes a decrease in pressure according to Boyle's Law. This movement typically allows an intake of air or fuel mixture in combustion engines or creates a vacuum in other applications. The downward motion can also help in drawing in the necessary fluids for the next cycle. Additionally, in a combustion engine, this phase is part of the intake stroke, preparing for the compression stroke that follows.

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11mo ago

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