Carbonated water and conveyor belt: what they have in common

1. Step 1. Carbonated water — is used in — Soda siphon. Soda water.
2. Step 2. Soda siphon — has part — Valve. A valve.
3. Step 3. Valve — is part of — Bellows. A valve in the bellows lets air in when they open and keeps it from escaping back.
4. Step 4. Bellows — is made of — Leather. Bellows are a leather bag.
5. Step 5. Leather — is material for — Conveyor belt. The first belts were leather.

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