Why is the density of gases lower in the upper atmospheric layers?
Answer and explanation
Correct answer: Most air is concentrated below under gravity
The governing concept is the effect of gravity on atmospheric gases. Gravity pulls gas molecules toward Earth, so the lower layers contain most of the atmosphere and experience greater pressure. As altitude increases, the number of molecules in a given volume generally decreases, causing lower density. Therefore, option D is correct; sunlight, water vapour, and surface distance do not explain the main pattern.
Frequently asked questions
What is the correct answer to this question?
Most air is concentrated below under gravity
Why is this the correct answer?
The governing concept is the effect of gravity on atmospheric gases. Gravity pulls gas molecules toward Earth, so the lower layers contain most of the atmosphere and experience greater pressure. As altitude increases, the number of molecules in a given volume generally decreases, causing lower density. Therefore, option D is correct; sunlight, water vapour, and surface distance do not explain the main pattern.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting.
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