Metal shackle and freezer: what they have in common

1. Step 1. Metal shackle — is part of — Padlock. A steel clip.
2. Step 2. Padlock — has part — Spring. The mechanism’s springs.
3. Step 3. Spring — is part of — Bogie. Spring suspension.
4. Step 4. Bogie — is part of — Refrigerator car. Bogies.
5. Step 5. Refrigerator car — uses — Vapour-compression cycle. Later — refrigeration machines.
6. Step 6. Vapour-compression cycle — is used in — Freezer. The vapour-compression cycle produces the cold.

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