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Chapter 9: Transfer of Thermal Energy, these particles collide with…

- - - - when fluid are heated, it expand and become less dense
        
        less dense fluid rises from heating source
        
        cooler fluid is more dense and sinks to replace less dense fliud
        
        thus, it sets up a convection current
  - - - material medium= substance (material) that the thermal energy travels in is called the medium
        
        good emitter of radiant heat is also a good absorber of radiant heat
        
        :star: TCAT
        
        Texture, colour, area, temperature