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Illustration of convection currents

  1. Jun 25, 2014 #1
    When convection currents are illustrated they are often painted as arrows with red and blue color, the red one being the direction of warmer currents and the blue ones being the direction of cooler currents. See for example this picture:
    image.png

    But how does this go together with the fact that heat is defined as always going from parts of higher temperature to parts of lower temperature? Wouldn't that only be the red arrows then? Does that mean that the currents represented by blue arrows doesn't actually exist?
     
  2. jcsd
  3. Jun 25, 2014 #2

    A.T.

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    You are confusing movement of air with transport of heat within air.
     
  4. Jun 25, 2014 #3
    Ok, but wouldn't the transport of heat within air be in the same direction as the red arrows?
     
  5. Jun 25, 2014 #4

    olivermsun

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    No, the molecular diffusion of heat will be from warm toward cold, or opposite to the direction of the (convection) arrows.
     
  6. Jun 25, 2014 #5

    A.T.

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    At some points, but it can also be in the opposite direction or perpendicular to it.
     
  7. Jun 25, 2014 #6
    When talking about transport of heat within air, is that refering to radiation?
     
  8. Jun 25, 2014 #7

    A.T.

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    No, diffusion.
     
  9. Jun 25, 2014 #8
    Is diffusion the same as conduction?
     
  10. Jun 25, 2014 #9

    A.T.

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