Nitrogen constitutes ____of the air by volume.
90%
15%
65%
Nitrogen is the major component. It constitutes 78% of the air by volume.
Carbon dioxide constitutes about ________ % by volume in air.
Question 1 Air is a mixture of various gases. One of the gases constitutes 21% part of the air and is essential for the survival of human beings. This gas is: (a) Nitrogen (b) Oxygen (c) Ozone (d) Argon