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Huff and puff apparatus
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Huff and puff apparatus : ウィキペディア英語版
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 limewater or bicarbonate indicator shows the increased presence of carbon dioxide in the outgoing breath.This turns the bicarbonate into milky white substance.
==See also==

* Respiration (physiology)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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