Absorbent sample pad and freezer: what they have in common

1. Step 1. Absorbent sample pad — is part of — Pregnancy test. It receives the sample.
2. Step 2. Pregnancy test — uses — Capillary action. Capillary flow of the liquid.
3. Step 3. Capillary action — is used in — Heat pipe. The liquid returns along the wick by capillary action.
4. Step 4. Heat pipe — uses — Latent heat. Evaporation and condensation.
5. Step 5. Latent heat — is used in — Vapour-compression cycle. The evaporation of the refrigerant produces cold.
6. Step 6. Vapour-compression cycle — is used in — Freezer. The vapour-compression cycle produces the cold.

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