Capillary action and steam locomotive: what they have in common

1. Step 1. Capillary action — is used in — Heat pipe. The liquid returns along the wick by capillary action.
2. Step 2. Heat pipe — uses — Latent heat. Evaporation and condensation.
3. Step 3. Latent heat — is used in — Ice cream maker. Ice with salt draws away heat.
4. Step 4. Ice cream maker — has part — Crank. A handle.
5. Step 5. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.

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