Fire-tube boiler and dewar flask: what they have in common

1. Step 1. Fire-tube boiler — uses — Heat transfer. A larger heating surface.
2. Step 2. Heat transfer — is used in — Thermal insulation. Reducing heat transfer.
3. Step 3. Thermal insulation — is used in — Vacuum flask. Insulation.
4. Step 4. Vacuum flask — evolved from — Dewar flask. A household Dewar flask.

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