Moka pot and lead–acid battery: what they have in common

1. Step 1. Moka pot — has part — Safety valve. A valve.
2. Step 2. Safety valve — is part of — Boiler. A mandatory safeguard for boilers.
3. Step 3. Boiler — is part of — Steam turbine. Steam from the boiler.
4. Step 4. Steam turbine — is part of — Nuclear submarine. A turbine turns the propeller.
5. Step 5. Nuclear submarine — evolved from — Submarine. Nuclear power let submarines stay submerged for months.
6. Step 6. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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