espere ESPERE-ENC working area - preliminary unevaluated websitesEnvironmental Science Published for Everyobody Round the Earth
Printer friendly version of this page
[Master Home]    English Sitemap    [Master Sitemap]    www.espere.net   
Upper Atmosphere
basics
1. Understanding the stratosphere
2. Ozone hole
- ozone formation
- ozone hole & CFC
* Worksheet 1
* Worksheet 2
more
     
 

Download

 

Higher Atmosphere

Basics

2. Ozone and light

Worksheet 2

 

basicsmore
basicsmore
basicsmore
basicsmore
basicsmore
basicsmore
basicsmore
basicsmore
 

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:

Be careful: 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.)

 

1


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?

 

Download

Movie: OzoneAndLight.avi (192kB)
About this page:
Authors: M. Seesing, M. Tausch - Universität Duisburg-Essen, Duisburg / Germany
Rewiewer:
Last update: 2004-05-24

 top

ESPERE / ACCENT

last updated 09.07.2005 14:15:51 | © ESPERE-ENC 2003 - 2013