PH-2153
Conduction
Physics · Secondary 4 · Medium · Conduction
A freezer door has a layer of plastic foam inside the metal outer surface. Why is plastic foam used between the cold air inside and the warm air outside?
- It reduces heat conducted into the freezer by acting as an insulator
- It increases heat conduction so the freezer cools the room faster
- It conducts heat well so the inside and outside quickly reach the same temperature
- It allows convection currents to carry more heat through the door
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