Wind tunnel and boyle’s air pump: what they have in common

1. Step 1. Wind tunnel — uses — Drag. Measuring resistance.
2. Step 2. Drag — is used in — Retractable landing gear. Retracting reduces drag.
3. Step 3. Retractable landing gear — has part — Hydraulic cylinder. Retraction cylinders.
4. Step 4. Hydraulic cylinder — has part — Piston. The piston is moved by liquid.
5. Step 5. Piston — is part of — Boyle’s air pump. A plunger.

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