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    dr a m m mustaf's Avatar
    dr a m m mustaf Posts: 1, Reputation: 1
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    #1

    Aug 11, 2014, 12:13 AM
    Sedimentation law in physics
    How to describe particles existense in the lower atmosphere?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Aug 11, 2014, 02:15 PM
    They are from space debris or general dust. Gravity pulls them down but air currents can lift them back up.
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