Ice cube trays and payment card: what they have in common

1. Step 1. Ice cube trays — is part of — Ice machine. A tray for cubes.
2. Step 2. Ice machine — uses — Refrigerant. A refrigerant.
3. Step 3. Refrigerant — is material for — Air conditioner. Inside is a refrigerant.
4. Step 4. Air conditioner — is used in — Cleanroom. Air filtration.
5. Step 5. Cleanroom — is used in — Integrated circuit. Production in cleanrooms.
6. Step 6. Integrated circuit — is part of — Payment card. An EMV chip.

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