1 mm layer of pure ozone gas around earth at normal temperature and pressure…
2022
1 mm layer of pure ozone gas around earth at normal temperature and pressure is equivalent to:
Answer: C. 100 DU — ConceptA Dobson unit measures total-column ozone by the thickness that the ozone would occupy if compressed to standard temperature and pressure. By…
- A.
1 Dobson Unit (DU)
- B.
10 DU
- C.
100 DU
- D.
0.1 DU
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Correct answer: C
Concept
A Dobson unit measures total-column ozone by the thickness that the ozone would occupy if compressed to standard temperature and pressure.
By definition, 1 DU corresponds to an ozone layer 0.01 mm thick at standard conditions.
Application
Use the conversion 1 DU = 0.01 mm.
For a 1 mm layer, divide 1 mm by 0.01 mm per DU.
1 ÷ 0.01 = 100, so the column amount is 100 DU.
Cross-check
Multiplying 100 DU by 0.01 mm per DU gives 1 mm, which reproduces the stated layer thickness.
Result
Therefore, a 1 mm layer of ozone at standard temperature and pressure is equivalent to 100 DU.