1. using a model try physical (Physical Model) is to create a model of the origin and nature of the surrounding area to look like real, as much as possible. Using the thumbnails, has a 100: 1 ratio is up to 1: 5000 and then study the spread of dust from the cradle to the atmosphere. This method will give you the closest to the. Very true, but they are very expensive, such as a machinery factory, which was established to try show before (Pilot plant)
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