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Moelcules in air in the atmosphere are a...

Moelcules in air in the atmosphere are attracted by gravitational force of the earth. Explain why all of them do not fall into the earth just like an apple falling from a tree.

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Air molecules in the atmosphere experience vertically downward force due to gravity, just like an apple falling vertically from a tree. Due to temperature, the air molecules have random motion. Due to it, the velocity of air molecules is not exactly in the vertical downward direction. the downward gravity pull on ait molecules increase the density of air in the atmosphere close to earth. It is due to this reason, the density of air decrease as we go up.
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Knowledge Check

  • The gravitational force of the earth on a freely falling ball of mass one kilogram is 9.8 N. The acceleration of the earth towards the ball is

    A
    ` 9.8 ms ^(-2)`
    B
    negligible.
    C
    slightly less than `9.8 m s^(-2)`.
    D
    more than `9.8 m s^(-2)`

  • The gravitational force of the earth on a freely falling ball of mass one kilogram is 9.8 N. The acceleration of the earth towards the ball is

    A
    ` 9.8 ms^(-2)`
    B
    negligible.
    C
    Slightly less than ` 9.8 ms^(-2)`
    D
    more than `9.8 ms ^(-2)`

  • An object moving the earth under the influence of Earths gravitational force is in a state of free - fall.

    A
    Statement -1 is True, Statement -2 is True, Statement 2 is a correct explanation for Statement -1
    B
    Statement -1 is True, Statement for Statement -2 is True , Statement - 2 is NOT a correct explanation for Statement -1`
    C
    Statement -1 is True, Statement -2 is False
    D
    Statement -1 is False, Statement -2 is True