Settling time experiment operating

A spherical vacuum chamber several hundred meters in radius, capable of achieving a vacuum less than 10-15 atm and operating at 10 9 atm might be possible, but would be very expensive. Heating the system to more than 2000K only adds spice to the problem. If the system were built and, in the one-meter cube center, SiO molecules were introduced at 104 cm-3, then condensed to make 10 nm grains ( 105 SiO molecules per grain) that are allowed to settle onto a 10 m square collection plate, and if this experiment were repeated 10 times, then the collector would... 

In the case of adsorption experiment carried out at constant pH, the above procedure was somewhat modified. The rotation of tubes was stopped after 8 hr and the suspension was allowed to settle for a period of time depending on the particle size of the solid sample. The pH was checked and, if necessary, readjusted to its original value. The operation was repeated until no changes in pH were observed. 

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