Sticking plaster and freezer: what they have in common

1. Step 1. Sticking plaster — is part of — First aid kit. Plasters.
2. Step 2. First aid kit — is made of — Tin. A tin box.
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 — Freezer. The vapour-compression cycle produces the cold.

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