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Using a model to explain evaporation

Discussion in 'Science' started by Cosmic_Rainbow, Nov 10, 2011.

  1. Cosmic_Rainbow

    Cosmic_Rainbow New commenter


    any ideas? They will complete an evap practical but then they need to model evaporation. Thanks [​IMG]
     
  2. blazer

    blazer Star commenter

    Role play?

    Rearrange the desks to make a 3 sided box and cram them in. Get them to model behavior in a liquid (move around at random but stay close) then pull the kids at the surface (open side) out one by one and send them on a journey round the lab. Occasionally push one back into the crowd as not all particals escape.

    Then repeat on a small scale by allowing a small drop of ethanol to evaporate. (or igve them some hand cleanser and let it dry off their hands.

    Questions,
    How do toilet hand driers work? Why use warm air?

    Why does washing dry faster on a windy day?

    Top set groups. Why does the windscreen demister in a car use air that has gone through the AC system (in other words it is cold but very dry)?
     
  3. Going back to Nuffield Co-ordinated Science days: a large flat tray (with sides), held at a slight angle. Arrange marbles in rows - solid. Start to provide energy (jiggle the tray GENTLY) - the particles remain in rows but vibrate. Jiggle a bit harder - the rows collapse, representing the solid melting - the particles can move about. Jiggle harder and some particles leave the "top" of the mass of "liquid" - evaporation. If some are removed, the amount of material will decrease; otherwise you might talk about a saturated vapour, where as many leave the surface as return to the "liquid". Lots of energy results in a "gas" - the particles move at random across the whole of the tray, bouncing off the walls of the container.
    This used to be a "pupil demonstration", with enough kit for them to work in pairs. Guaranteed to cause mayhem and a lot of noise if not done in a VERY controlled manner! [​IMG]
     
  4. bogstandardcomp

    bogstandardcomp New commenter

    get them to make a flash animation?
     
  5. hi
    welcome to this forum site
    it is really difficult to make a model of evaporation
    thanks
    -------------------------------

    Struts2 Jquery
     

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