Question

Atmosphere consists of 79 nitrogen and 21 oxygen by

Answer 1

Answer: These two gases are present as percentage by volume.

Explanation: Atmosphere is a layer which consists of mixture of gases. The gases which are present in air are Nitrogen, oxygen, carbon dioxide, argon and some other gases in trace amounts.

These gases are present as percentage by volume in air.

Percentages of gases are as follows:

Nitrogen: 78%

Oxygen: 21%

Argon: 0.9%

Carbon dioxide: 0.03%

Other gases: In trace amounts

Answer 2

Atmosphere consists of 79 nitrogen and 21 oxygen by Volume

Explanation:

• Atmosphere is the air and it is much more than the air which we breathe.
• Our atmosphere is made up different gases in different composition.
• Composition of different gases varies in two different ways say for by volume and by weight or mass.
• Atmosphere is made up of non homogenous mixture of gases.
• Atmospheric gases consists of 79 percent nitrogen, 21 percent oxygen, as major component 0.9 percent argon and 0.1 percent other gases by volume.
• By weight or by mass percent, air consists of 75 percent nitrogen, 23 percent oxygen as major, 0.05 percent carbon dioxide, 0.0007 hydrogen  ar minor and other gases as trace component including argon, helium, neon etc.

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