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Question
Exosphere is the most rarefied layer of the atmosphere. Which of the following factors is responsible for this fact?
Options
Temperature
Pressure
Gravity
Air pollution
MCQ
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Solution
Gravity
Explanation:
The exosphere is the most rarefied (least dense) layer of the atmosphere. This is because gravity is very weak at such high altitudes, so the gas molecules there are not held tightly and can easily escape into space. As a result, the air is extremely thin and sparsely populated with gas particles. Temperature, pressure, and air pollution do not directly cause this rarefied condition; it is mainly due to the diminished gravitational pull at the exosphere level that allows gases to disperse widely into the near-vacuum of space.
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