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  4. One Dobson unit is equal to a layer of pure ozone in thickness at standard temperature and pressure.

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Q. One Dobson unit is equal to a layer of pure ozone _______ in thickness at standard temperature and pressure.

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Solution:

The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson units. The number of molecules of ozone required to produce a layer of pure ozone 0.01 mm thick at a pressure of 1 atmosphere and 0oC is one Dobson unit.