The aim of the experiment is to visualise the interaction of Ozone with UV light, the reaction that serves to protect the earth from sun's hard UV rays.

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   Description of the Experiment   

The presentation technique uses a fluorescent lamp radiating UV light on a fluorescent landscape. When Ozone is injected above this landscape, the fluorescence of the landscape will decrease in the areas where the Ozone will absorb the UV light. To the visitor it seems as if live darker clouds are slowly drifting above the landscape.

The landscape is illuminated with UV light and a sign on a small model factory on the surface is flashing: "UV-alarm". When the visitor press the "Ozone" button, the Ozone generator is activated and real Ozone is injected above the surface. Shortly after this Ozone is seen as a dark cloud drifting about the landscape and the UV warning stops flashing.

The view box is airtight and the Ozone injected is removed in about 10 seconds by means of a pump and a special filter so the experiment can start over again.

   Duration   

The whole experiment lasts about 2 minutes.

   Conclusion   

The "Ozone Layer" interactive exhibit provides information on the importance of stratospheric ozone in the protection of short wave ultraviolet radiation from the sun. A low concentration of ozone produced from pure oxygen in an ozone generator is absorbing short wave UV-C radiation. The absorption is made visible by use of a fluorescent technique.

   Detailed Conclusion   

Solar radiation at wavelengths below 300 nm is almost completely screened out by oxygen and ozone in the stratosphere. This is most fortunate, because radiation in this region of the spectrum is particularly damaging to living things.