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Breathing

The percentag...

Question

The percentage of oxygen in inhaled air is ___________.

A

10%

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B

21%

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C

15%

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D

4.4%

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Solution

The correct option is B
21%

Inhalation is the process of drawing of air into the lungs. During the process of inhalation, the lung volume expands as a result of the contraction of the diaphragm and intercostal muscles. The air that we inhale contains 21% oxygen. The percentage of carbon dioxide in exhaled air is 4.4%.

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Similar questions

The percentage of oxygen in inhaled air is 21%.

Q. A scientist performed experiments to analyse the two samples of air given to him:
'Air Sample A' and 'Air Sample B'. The results of analysis of these two air samples are given below:

Air Sample A				Air Sample B
Oxygen	:	21%		Oxygen	:	16.4%
Carbon dioxide	:	0.04%		Carbon dioxide	:	4.4%
Water vapour	:	A little		Water Vapour	:	A lot

(a) Which air sample, A or B, represents 'exhaled air'? Why?
(b) Which air sample, A or B, represents 'inhaled air'? Why?

Q. As oxygen is ______ soluble in water, air dissolved in water contains a higher percentage of oxygen (

30 - 35

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21

Q. As oxygen is ______ soluble in water. Air dissolved in water contains a higher percentage of oxygen (30-35%) than ordinary air (21%).

Q. Air dissolved in water contains a higher percentage of oxygen

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