GCSE Combined Science (AQA)

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Insulation

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Energy Conservation and dissipation of energy

Insulation

3:14 Reducing Energy Losses
Spec 4.1.2.1
Previous Heat in Homes Next Fossil Fuels
  • Heat flow occurs between two points with a temperature difference.
  • Example: Heat flow from a hot drink to cooler surroundings causes the drink to cool down.
  • Insulation reduces energy loss from heat flow.
  • Insulation involves wrapping an object with a low thermal conductivity material to slow heat flow.
  • Insulation saves energy, time, and money by reducing the need to reheat or cool items.
  • A flask is an example of insulation, keeping drinks warm by reducing heat flow.
  • A fridge is insulated to keep the inside cold by reducing heat flow from the warmer outside.
  • Materials with low thermal conductivity slow heat flow.
  • Metals are good conductors of heat due to closely packed atoms.
  • Foam, with trapped air pockets, is a poor conductor of heat.
  • Thicker materials increase insulation as heat takes longer to travel through them.
  • T-shirts allow quick heat escape, useful on hot days.
  • Coats slow heat escape, useful on cold days.
  • Insulator thickness is limited by cost and practicality.
  • Understanding insulation application may be required in exams.

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