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In order to conserve energy in our homes we must try to prevent heat loss - Junior Cycle Science - Question b - 2015
Question b
In order to conserve energy in our homes we must try to prevent heat loss. Double-glazed windows reduce heat loss. Explain how they do this.
Worked Solution & Example Answer:In order to conserve energy in our homes we must try to prevent heat loss - Junior Cycle Science - Question b - 2015
Step 1
Reference to gas / gap / vacuum
Answer
Double-glazed windows consist of two layers of glass with a space or gap between them, which is often filled with a gas such as argon. This gap acts as a barrier to prevent heat transfer. In some cases, the space may be left as a vacuum, significantly reducing heat loss through conduction and convection.
Step 2
Reference to insulator / insulation / poor conductor
Answer
The materials used in double-glazing, particularly the gas in the gap, provide insulation. Gases like argon are poor conductors of heat, which slows down the transfer of thermal energy from one side of the window to the other. This effect ensures that more heat stays inside the home during colder months, thereby conserving energy.