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Huff and puff apparatus



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Huff and puff apparatus

 

The huff and puff apparatus is used in school biology labs to demonstrate that carbon dioxide is a product of respiration. A pupil breathes in and out of the middle tube. The glass tubing is arranged in such a way that one flask bubbles as the pupils breathes in, the other as the pupil breathes out. A suitable carbon dioxide indicator, such as lime water or bicarbonate indicator shows the increased presence of carbon dioxide in the outgoing breath.This turns the bicarbonate into milky white substance.

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Huff_and_puff_apparatus". A list of authors is available in Wikipedia.
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