differentiate between inspired and alveolar air on the basis of CO2 content
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CO2 has a partial pressure of 0.3 mmHg in air and 40mmHg in alveoli.
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The air that we inspire is a mixture of gases. The most important of these are nitrogen, oxygen, carbon dioxide and water vapour. The air that we expire is not the same. ... When the warm, wet air from our lungs meets the cold air of the atmosphere the water vapour condenses into mist.
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