Can body and heat pump: what they have in common

1. Step 1. Can body — is part of — Tin can. A tin cylinder.
2. Step 2. Tin can — is made of — Tin. Tinplate.
3. Step 3. Tin — is material for — Ice cream maker. Inside is a tin cylinder.
4. Step 4. Ice cream maker — uses — Latent heat. Ice with salt draws away heat.
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 — Heat pump. The same cycle as in a refrigerator.

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