In a normal apartment, you usually don’t have to look far to find dust anywhere. You don’t even have to get up from my office chair to see dusty spots behind the computer, in the corners of the desk, and in so many other places. In my case, this is due to the reluctance to clean. But I can’t do anything about all the other dust that’s scattered around the world. It is generated by processes that can be described, among other things, with this equation:
This “Bagnold Formula”, after the English geologist and desert researcher Ralph Bagnold, describes the phenomenon of salinity. This is one way that tiny grains of sand can move around, carrying dust into the atmosphere. If there is loose rocky material lying around somewhere, it can be moved by the wind. If the wind is weak, the granules roll a little. Above a certain wind strength, it can be thrown into the air and then returned to the ground. During this salinity, new, smaller rock particles can precipitate out as the particles hit the ground. Depending on their size, it is possible for them to travel many kilometers in the air or spread through the atmosphere over the entire Earth.
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Bagnold developed his formula from observations he made in 1932 while crossing the Libyan desert while serving in the British Army. The amount of moving mass in it F denotes , ρ is the air density and g local gravitational acceleration. with any And Dr described the characteristic sizes of sand grains, c is a constant that depends on the sand grain size distribution, and And* It gives the rate of shear stress, which is affected by the shear stress between wind and quicksand.
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