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
    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?