Balance scale and freezer: what they have in common

1. Step 1. Balance scale — evolved into — Electronic scales. Electronic scales.
2. Step 2. Electronic scales — has part — Strain gauge. A strain gauge.
3. Step 3. Strain gauge — is made of — Nickel. The grid is constantan (copper with nickel).
4. Step 4. Nickel — is material for — Gas turbine. The blades are nickel superalloys.
5. Step 5. Gas turbine — has part — Compressor. A compressor.
6. Step 6. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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