Flame trench and boiler: what they have in common

1. Step 1. Flame trench — is part of — Launch complex. A pit that carries away the hot gases.
2. Step 2. Launch complex — uses — Rocket. Launching rockets.
3. Step 3. Rocket — has part — De Laval nozzle. A narrowing at the outlet accelerates the gases and increases thrust.
4. Step 4. De Laval nozzle — evolved from — Steam turbine. De Laval invented the nozzle for a steam turbine.
5. Step 5. Steam turbine — has part — Boiler. Steam from the boiler.

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