Double glass walls e congelador: o que têm em comum

1. Passo 1. Double glass walls — faz parte de — Vaso de Dewar. Two bulbs, one inside the other.
2. Passo 2. Vaso de Dewar — evoluiu para — Vacuum flask. A household Dewar flask.
3. Passo 3. Vacuum flask — utiliza — Thermal insulation. Insulation.
4. Passo 4. Thermal insulation — faz parte de — Congelador. Polyurethane foam in the walls.

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