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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.

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  1. CountryGent

    Well now, that was interesting ....

    So, out of the blue, two junkies show up at our back porch. The Smurf yells "someone's here!," I grab a piece, and crack the back door and ask what is up. I instantly notice they are both high as a fing kite. They said something like "yah, um, your neighbor (also a worthless druggie idiot) saw...
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