AQA Physics

• How does insulation slow down heat transfer?

  It works by providing a barrier of low thermal conductivity.
• What are the key points of thermal insulation?

  - Insulation slows down the transfer of heat - It works by providing a barrier of low thermal conductivity - The goal is to maintain temperature differences between areas
• What is the primary purpose of thermal insulation?

  To reduce the rate of heat transfer between objects or areas.
• Why is trapped air a better insulator than moving air?

  Trapped air limits heat transfer through convection.
• How do air bubbles in materials affect heat transfer?

  1. Reduced conduction: Interrupts solid material, reducing direct heat conduction paths. 2. Limited convection: Small air pockets restrict air movement, minimizing convective heat transfer. 3. Radiation barrier: Reflects some infrared radiation, further reducing heat transfer.