Manometer and freezer: what they have in common

1. Step 1. Manometer — is part of — Boiler. The gauge on a boiler shows the steam pressure — without it the boiler could explode.
2. Step 2. Boiler — uses — Latent heat. Evaporation needs latent heat.
3. Step 3. Latent heat — is used in — Vapour-compression cycle. The evaporation of the refrigerant produces cold.
4. Step 4. Vapour-compression cycle — is used in — Freezer. The vapour-compression cycle produces the cold.

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