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haute atmosphère
Bases
1. Connaître la stratosphère
2. Trou d'ozone
- formation de l'ozone
- trou d'ozone et CFC
* Exercices 1
Ozzy Ozone
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Higher Atmosphere

Basics

2. Ozone and light

Worksheet 2

 

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Ozone is very important in our stratosphere, because of its characteristics in connection with a special and harmful quality of light. The experiment (E) will give you some impressions about that. With the help of the tasks (T) it will be easy to understand the important effect of ozone in the stratosphere.

The equipment, pictured in fig. 1, is made to form ozone of oxygen in the same way as it is formed by the Chapman- cycle in the stratosphere. A special lamp is necessary inside (e.g.: a middle pressure mercury vapor lamp).

 

 

fig. 1  formation of ozone                       © 2003 Seesing, Tausch; Duisburg
A: fluorescent lamp ballast
B: ____________lamp
C: reactor
D: oxygen
E: ozone 
                

  • T1

Explain briefly, why a normal incandescent lamp is not useful to form ozone.

  • T2

Enter the necessary characteristic of lamp in the legend of fig.1 to "B:".

 

 

You need a darkenable room and following materials for the experiments:

Mention: The chemicals oxygen and ozone (and if used the short waved UV-light) are harmful. Experiment carefully and protect yourselves! (Cover the UV-light-reaction chamber with aluminium foil, to protect your eyes.)

 

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1



1

 

equipment to form ozone

fluorescent screen, or a TLC-foil with fluorescent indikator F254

UV-hand lamp (λ=254 nm)

glass tubes to pass through the ozone

aluminium-foil (to darken, it depends on the kind of equipment to form ozone you use)

 

F:  fluorescent screen (λ=254nm)
G: ozone ( oxygen mixture)
H: UV-hand lamp (λ=254nm)
© 2003 Seesing, Tausch; Duisburg

  • E1

Form ozone and drive it in short pulses through a glass tube between the fluorescent screen and te UV-hand lamp. (alternatively: click on the picture and regard a short film.[OzoneAndLight.avi  192kB])

  • T3

Describe briefly, what you can see, if you drive ozone (content mixture of gases) in short pulses troug the glass tube between the fluorescent screen (λ=254 nm) and the UV-lamp (λ=254 nm).

  • T4

What is the reason of this observation?

  • T5

Why is this characteristic very important for the life on earth?

worksheet 1: StratBasicOzoneAndLightk1.pdf (206kB)
worksheet 1 solution: StratBasicOzoneAndLightSolk1.pdf (218kB)
movie: OzoneAndLight.avi (192kB)
 

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last updated 25.02.2005 23:02:52 | © ESPERE-ENC 2003 - 2013