1 mm layer of pure ozone gas around the earth at normal temperature and pressure is equivalent to:

Question

Question

This question was previously asked in

UGC NET Paper 1: Held on 12 Oct 2022 Shift 1

Answer 1

The correct answer is 100 DU.

Key Points

Ozone in the atmosphere is measured in "Dobson" units.
The number of ozone molecules needed to produce a layer of pure ozone 0.01 millimetres thick at a temperature of 0 degrees Celsius and an atmospheric pressure of one Dobson unit.
- As we know: 0.01mm = 1 Dobson unit.
- Then 0.50mm = 50 DU
- So, 1mm = 100 DU.

Thus, a 1 mm layer of pure ozone gas around the earth at normal temperature and pressure is equivalent to 100 DU.

Additional Information

The ozone layer is typically around 300 Dobson Units thick across the surface of the Earth.