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heat energy (movement of heat (radiation (radiators (black is good (amount…

- - - - metals are
    - - touch test
        
        feel cold=conductor and vice versa
      - keep heat in or out
  - - - black is good
        
        amount of heat radiated depends on
        
        nature of surface
        
        total surface area
        
        temp. difference
  - - - cycle
    - - air conditioner, cooling system in a car
- - - - effects
        
        large forces may be set up
        
        e.g electrical wires being taut
        
        rails, pipes, concrete pavements
        
        have to allow gaps for expansion
        
        uses
        
        opening a jar
        
        rivets
        
        bi-metalic strips
        
        thermostats
        
        thermometers
        
        they bend with temperature increase or decrease