Freezer and rolling mill: what they have in common

1. Step 1. Freezer — has part — Compressor. A compressor compresses the refrigerant.
2. Step 2. Compressor — is part of — Gas turbine. A compressor.
3. Step 3. Gas turbine — has part — Turbine. A turbine.
4. Step 4. Turbine — evolved from — Water wheel. The water turbine evolved from the water wheel.
5. Step 5. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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