The video explains how cylinders use fluid pressure to convert pneumatic energy into mechanical force. It covers different types of cylinders: Single-acting cylinders have fluid pressure on one side of the piston for the forward stroke. Their symbol includes an open rectangle indicating external force is needed to retract the rod, with an open rod end exposed to atmosphere and a vertical line denoting the air port. Variants include: - **Spring-returned**: Air pressure drives forward motion, with

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