Door closer and shipping container: what they have in common

1. Step 1. Door closer — uses — Hydraulics (Pascal’s law). Hydraulic damping.
2. Step 2. Hydraulics (Pascal’s law) — is used in — Shock absorber. Oil flows through valves, damping oscillations.
3. Step 3. Shock absorber — is part of — Landing gear. Shock struts.
4. Step 4. Landing gear — is part of — Cargo aircraft. Landing gear for dirt airstrips.
5. Step 5. Cargo aircraft — uses — Shipping container. Air cargo containers.

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