Rocket fins and pneumatic tube: what they have in common

1. Step 1. Rocket fins — is part of — Rocket. Tail feathers or a stick keep the rocket on course.
2. Step 2. Rocket — has part — De Laval nozzle. A narrowing at the outlet accelerates the gases and increases thrust.
3. Step 3. De Laval nozzle — is part of — Ramjet. The nozzle accelerates the combustion products.
4. Step 4. Ramjet — uses — Compressed air. The air is compressed by the oncoming flow.
5. Step 5. Compressed air — is used in — Pneumatic tube. Air pressure.

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