Effect of degassing on particle size

Discussion in 'General Science' started by boks, Jan 25, 2009.

  1. boks

    Thread Starter Active Member

    Oct 10, 2008
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    0
    The specific surface area of polluting dust particles has been determined by gas adsorption:

    Treatment__________________Asp (m2g-1)
    4 h under vacuum at 200 °C_____5.61
    8 h under vacuum at 25 °C_____2.81


    Assume that they are monodisperse spheres of density r = 2.2 g/cm3. Calculate the radius of the particles.
    Propose an explanation for the effect of degassing on particle size.


    The radia are 243 nm and 485 nm, but what is the explanation?
     
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