What generally happens to air density as height increases?
Answer and explanation
Correct answer: It decreases
Air density is the mass of air contained in a unit volume. Gravity concentrates more air molecules near Earth’s surface. As altitude rises, atmospheric pressure falls, molecules are farther apart, and the mass in the same volume becomes smaller. Therefore density generally decreases with height, making option B correct. It is not exactly constant, and air does not turn into soil; option A gives the opposite trend.
Frequently asked questions
What is the correct answer to this question?
It decreases
Why is this the correct answer?
Air density is the mass of air contained in a unit volume. Gravity concentrates more air molecules near Earth’s surface. As altitude rises, atmospheric pressure falls, molecules are farther apart, and the mass in the same volume becomes smaller. Therefore density generally decreases with height, making option B correct. It is not exactly constant, and air does not turn into soil; option A gives the opposite trend.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Trial Balance and Rectification of Errors.
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