Fuel injector and plumbing: what they have in common

1. Step 1. Fuel injector — is part of — Ramjet. It injects fuel into the flow.
2. Step 2. Ramjet — has part — De Laval nozzle. The nozzle accelerates the combustion products.
3. Step 3. De Laval nozzle — is part of — Liquid-propellant rocket engine. A nozzle.
4. Step 4. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.
5. Step 5. Centrifugal pump — is part of — Water tower. Filled by pumps.
6. Step 6. Water tower — is part of — Plumbing. Maintaining pressure.

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