Air conditioner and micrometer: what they have in common

1. Step 1. Air conditioner — has part — Compressor. A compressor.
2. Step 2. Compressor — has part — Impeller. A centrifugal compressor is an impeller.
3. Step 3. Impeller — is part of — Water-jet propulsion. An impeller.
4. Step 4. Water-jet propulsion — is made of — Stainless steel. The impeller is stainless steel.
5. Step 5. Stainless steel — is material for — Vernier caliper. Stainless steel.
6. Step 6. Vernier caliper — evolved into — Micrometer. A more precise instrument.

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