Energy Transfer By Heating

Energy Transfer By Heating

1. Infrared Radiation

   • All objects emit and absorb infrared radiation
     • Hotter objects emit more infrared
     • Surface Types affect the amount of IR emitted/absorbed
       • Shiny/White Objects emit/absorb less.
       • Black/Matte absorb/emit more.
   • Electromagnetic Radiation
     • Waves

2. Kinetic Theory

   • Solids
     • Fixed Shape
       • Particles cannot move.
     • Cannot be compressed
       • No space for particles to move into
   • Liquids
     • Flow and take shape of container
       • Particles can move around each other.
     • Cannot be compressed
       • Particles are close togethyer and so have no space to move
   • Gases
     • Flow and Fill
       • Particles move quickly in all directions
     • Can be compressed
       • Space for particles to move into

3. Conduction

   • Metals are good conductors of heat, but non metals are insulators.
   • Diagram
   • Conduction in metals
     • Free Electrons
       • Electrons in a metal can lave the atom and move around freely. The free or delocalised electrons help transfer heat energy from the hotter part of the metal to the cooler part.
       • Ions
         • The bit of the atom left behind becomes a metal ion. The ions are packed closely together and vibrate continually, transferring the energy.

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