Moka pot and kiln: 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 — Central heating. A boiler.
4. Step 4. Central heating — evolved from — Hypocaust. The Roman hypocaust was an early central heating system.
5. Step 5. Hypocaust — has part — Firebox. A furnace outside the building.
6. Step 6. Firebox — is part of — Kiln. A combustion chamber.

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