Parachute pack and boyle’s air pump: what they have in common

1. Step 1. Parachute pack — is part of — Parachute. The packed canopy and the deployment mechanism.
2. Step 2. Parachute — uses — Drag. The canopy creates drag.
3. Step 3. Drag — is used in — Retractable landing gear. Retracting reduces drag.
4. Step 4. Retractable landing gear — has part — Hydraulic cylinder. Retraction cylinders.
5. Step 5. Hydraulic cylinder — has part — Piston. The piston is moved by liquid.
6. Step 6. Piston — is part of — Boyle’s air pump. A plunger.

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