Plate armour and freezer: what they have in common

1. Step 1. Plate armour — evolved into — Armour. Armour moves from people to machines.
2. Step 2. Armour — is part of — Tank. Armour protects the crew.
3. Step 3. Tank — has part — Gas turbine. Some tanks (T-80, Abrams) have a gas turbine engine.
4. Step 4. Gas turbine — has part — Compressor. A compressor.
5. Step 5. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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