Fine sand and air conditioner: what they have in common

1. Step 1. Fine sand — is material for — Hourglass. Fine, uniform sand.
2. Step 2. Hourglass — uses — Gravity flow. Sand pours through under gravity.
3. Step 3. Gravity flow — is used in — Sewerage. Waste water flows down a gradient.
4. Step 4. Sewerage — has part — Sewage treatment plant. Treatment plants.
5. Step 5. Sewage treatment plant — has part — Compressor. Blowers supply oxygen to the microbes.
6. Step 6. Compressor — is part of — Air conditioner. A compressor.

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