Heat

Heat

Heat Transfer
1. Convection
  1. Convection works in fluids (gases and liquids!)
    1. Some fluid is heated
      1. It rises as it is less dense
        It spreads throughout the area
        It then cools and sinks
        This begins again as the heater sucks in more fluid to replace that which is gone
2. Conduction
  1. Heat transfers from hot objects to cold objects
  2. The bigger the difference in heat, the faster the transfer
  3. Heat flow stops at equal temperatures
  4. In solids (especially metals) the primary method of heat transfer is heat being passed atom to atom along the chain
3. Radiation
  1. Everything eventually calls down as everything emits electromagnetic waves - thermal radiation
  2. Shiny objects reflect the waves better than black objects
    1. As a result
      1. Black objects gain and lose heat easily
      2. People are wrapped in silver blankets when they are rescued to conserve heat
Thermal Expansion
1. Bimetallic Strip
  1. Uses
    1. Fire Bells
    2. Temperature systems
    3. Air conditioning
    4. Thermometers
  2. What is it?
    1. One side expands more rapidly than the other
      1. The sides are riveted together
        This forces it to bend
    2. For example: Invar and Brass
2. With more heat
  1. The object expands more
    1. This means that in winter train tracks have gaps in them
      1. As in summer they will expand into the gaps due to the heat
  2. Liquids expand faster than solids
    1. And gases are the quickest of them all!

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	Created by Leon of House Crook almost 10 years ago