Ladder side rails and air conditioner: what they have in common

1. Step 1. Ladder side rails — is part of — Ladder. Two lengthwise uprights.
2. Step 2. Ladder — is part of — Fire truck. An extending ladder.
3. Step 3. Fire truck — has part — Centrifugal pump. A fire pump.
4. Step 4. Centrifugal pump — has part — Impeller. The impeller accelerates the liquid.
5. Step 5. Impeller — is part of — Compressor. A centrifugal compressor is an impeller.
6. Step 6. Compressor — is part of — Air conditioner. A compressor.

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