Instant coffee and plumbing: what they have in common

1. Step 1. Instant coffee — uses — Freeze-drying. Freeze-dried coffee.
2. Step 2. Freeze-drying — uses — Vacuum. Ice sublimating in a vacuum.
3. Step 3. Vacuum — is used in — Boyle’s air pump. The pump draws out the air.
4. Step 4. Boyle’s air pump — has part — Valve. Valves.
5. Step 5. Valve — is part of — Fire hydrant. A gate valve.
6. Step 6. Fire hydrant — uses — Plumbing. Plumbing.

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