Effect of degassing on particle size

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Degassing significantly affects the particle size of dust particles, as evidenced by the specific surface area measurements obtained through gas adsorption. The treatment under vacuum at different temperatures resulted in distinct surface areas, indicating that longer degassing times at higher temperatures lead to smaller particle sizes. The calculated radii of the particles were found to be 243 nm and 485 nm, respectively. The increase in size during gas adsorption suggests that gas molecules adhere to the particle surfaces, causing them to expand. Overall, the process of degassing influences both the physical characteristics and the behavior of the particles in their environment.
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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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You know the rules. What thoughts do you have on the question?
 
When particles adsorb gas particles, they grow larger?
 
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