Question

What is Dobson unit?

Hint:

Normal ozone = ~300 DU, Ozone hole =<220 DU.

Answer 1

Step 1: Definition.
Dobson Unit (DU) is a unit used to measure the thickness of the ozone layer in the atmosphere.
Step 2: Explanation.
1 DU corresponds to a 0.01 mm thick layer of pure ozone at standard temperature and pressure (STP).
Step 3: Normal values.
Average ozone concentration is about 300 DU. Values below 220 DU indicate an ozone hole.
Step 4: Conclusion.
Dobson unit measures ozone layer thickness and is important for studying ozone depletion.