Kinetic theory and freezer: what they have in common

1. Step 1. Kinetic theory — is used in — Thermodynamics. A microscopic foundation.
2. Step 2. Thermodynamics — is used in — Vapour-compression cycle. Thermodynamics describes the cycle.
3. Step 3. Vapour-compression cycle — is used in — Freezer. The vapour-compression cycle produces the cold.

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