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ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
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Olle, the Exploratorium has a good one; a large
fast-photosynthesizing leaf is sealed in a transparent
chamber. Air is passed over it and the output air goes
througn a carbon dioxide analyzer (an automatic
spectrophotometer). Shortly after the visitor turns a
strong light on the leaf, the carbon dioxide level falls
as it is used up in photosynthesis.
Of course, there are also waterweeds that have
bubbles of oxygen on them, from photosynthesis.
The actual process is a pretty complicated bit of
natural organic chemistry, and difficult to put across.
Good luck
Peter Anderson
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