Smokeless powder and sonar: what they have in common

1. Step 1. Smokeless powder — is material for — Solid rocket motor. The propellant is smokeless powder.
2. Step 2. Solid rocket motor — has part — De Laval nozzle. A nozzle.
3. Step 3. De Laval nozzle — evolved from — Steam turbine. De Laval invented the nozzle for a steam turbine.
4. Step 4. Steam turbine — is part of — Destroyer. Turbines.
5. Step 5. Destroyer — has part — Sonar. Underwater acoustics.

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