Soap and autoclave: what they have in common

1. Step 1. Soap — evolved into — Synthetic detergent. Synthetic detergents were invented in the First World War, when fat for soap ran short.
2. Step 2. Synthetic detergent — is used in — Dishwasher. Detergent.
3. Step 3. Dishwasher — has part — Centrifugal pump. A pump feeds water to the spray arms.
4. Step 4. Centrifugal pump — is part of — Central heating. A circulation pump.
5. Step 5. Central heating — has part — Boiler. A boiler.
6. Step 6. Boiler — is part of — Autoclave. A steam generator.

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