Textile and electric fan: what they have in common

1. Step 1. Textile — is material for — Parachute. A parachute canopy is sewn from light, strong fabric — first silk, later nylon.
2. Step 2. Parachute — uses — Drag. The canopy creates drag.
3. Step 3. Drag — is used in — Wind tunnel. Measuring resistance.
4. Step 4. Wind tunnel — has part — Electric fan. A fan.

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