P1c How Insulation Works

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FOUNDATION
ONLY on Foundation Tier

State that air in a material is a very good insulator.
Recognise that hot air rises and is replaced by falling colder air.

Recognise that infrared energy can be reflected from a shiny surface.
STANDARD
BOTH Foundation and Higher Tiers

Explain in domestic situations, how energy transfer can be reduced in terms of:

  1. conduction;
  2. convection;
  3. radiation.
HIGHER
ONLY on Higher Tier

Describe how energy is transferred by:

  1. conduction - transfer of KE between particles;
  2. convection - change of density causes (bulk) fluid flow;
  3. radiation – infrared radiation needs no medium.

Explain that, unless air is trapped in foam, there will still be energy loss by convection in a cavity wall.

 


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Lesson 2

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