Glass bell jar receiver and sewage treatment plant: what they have in common

1. Step 1. Glass bell jar receiver — is part of — Boyle’s air pump. A bell jar from which the air is pumped out.
2. Step 2. Boyle’s air pump — has part — Valve. Valves.
3. Step 3. Valve — is part of — Flush toilet. The cistern’s float valve.
4. Step 4. Flush toilet — uses — Sewerage. Draining the waste.
5. Step 5. Sewerage — has part — Sewage treatment plant. Treatment plants.

Open Evothings