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Q:
Is there any oxygen left in the air which we breathe out of our lungs?
- Chong Wee Lic (age 12)
Jiemin Primary, Singapore
A:
Hi Chong Wee,
Yup, we usually exhale at least half of the oxygen we inhale. It
depends of course on if we have been exercising, and whether or not we
have held our breaths and for how long. Mouth-to-mouth resucsitation
works mainly because there is still lots of oxygen in the air we
breathe out.
Tom
(published on 10/22/2007)
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