Types of Energy transfer by heating

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  • Energy transfer by heating
    • 1.4 Conduction
      • Occurs mainly in solids
        • Metals
          • free electrons gain kinetic energy and move through metal
            • Transfer energy by colliding with other particles
      • When one end is heated it gains kinetic energy which is passed onto neighbouring particles
        • free electrons gain kinetic energy and move through metal
          • Transfer energy by colliding with other particles
      • Insulators
        • Poor conductors
          • Wool,fibreglass (they contain lots of trapped air)
    • 1.5 Convection
      • Occurs in fluids
      • Fluid is heated & expands
        • Becomes less dense
          • *rises*
            • Cools & becomes denser
              • *sinks*
                • Fluid is heated & expands
                  • Becomes less dense
                    • *rises*
                      • Cools & becomes denser
                        • *sinks*
        • Can be on very small/large scale
      • Radiation
        • 1.1 Infrared radiation
          • Part of electromagnetic spectrum
            • Just beyond visible light
          • Makes skin feel warm
          • All objects emit it
            • The hotter the object, the more it emits
        • 1.2 Surfaces and radiation
          • Dark matt surfaces are good absorbers and emitters
            • Black matt objects transmit energy and cool down quicker than shiny white objects
          • Light shiny objects are good reflectors
            • Black matt objects transmit energy and cool down quicker than shiny white objects

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