Passive cooling system and rocket: what they have in common

1. Step 1. Passive cooling system — is part of — Small modular reactor. Removing heat without pumps or power.
2. Step 2. Small modular reactor — is a kind of — Nuclear reactor. A reactor.
3. Step 3. Nuclear reactor — is part of — Nuclear power plant. The reactor heats the coolant.
4. Step 4. Nuclear power plant — has part — Steam turbine. Steam turns the turbines — as at a thermal station.
5. Step 5. Steam turbine — evolved into — De Laval nozzle. De Laval invented the nozzle for a steam turbine.
6. Step 6. De Laval nozzle — is part of — Rocket. A narrowing at the outlet accelerates the gases and increases thrust.

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