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Question
What is the percentage of CO2 in the air we breathe out?
What is the percentage of CO2 in the air we breathe out?
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Solution
The correct option is C 4%
We breathe in oxygen and some of the carbon dioxide. When we exhale, we breathe out less oxygen but more carbon dioxide than we inhale. Carbon dioxide is a waste product, so the body exhales it in order to get rid of it. Compared to the low levels of about 0.04 percent in inspired air, exhaled air contains a hundred times more CO2, at 4 percent content. The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat.
We breathe in oxygen and some of the carbon dioxide. When we exhale, we breathe out less oxygen but more carbon dioxide than we inhale. Carbon dioxide is a waste product, so the body exhales it in order to get rid of it. Compared to the low levels of about 0.04 percent in inspired air, exhaled air contains a hundred times more CO2, at 4 percent content. The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat.
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