PH-716
Conduction
Physics · Secondary 3 · Medium · Conduction
Polystyrene foam is used as insulation in a refrigerator wall. Which statement best explains how it helps to keep the contents cool?
- It is a good conductor so heat escapes quickly.
- It reflects all visible light back into the fridge.
- It traps air, reducing conduction and convection through the walls.
- It increases the mass of the fridge so it stays cooler.
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