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Spirometry

Can someone please explain to me in a logical way of why the volume of air decreases in a spirometer.

Thanks
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Jpw1097
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Original post by SGHD26716
Can someone please explain to me in a logical way of why the volume of air decreases in a spirometer.

Thanks


The volume of air only decreases in a spirometer if you use soda lime to absorb the carbon dioxide which you expire. If you look at spirographs where no soda lime was used, the total volume remains constant.

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