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if you say any object having a certain mass must be on the
surface of the earth due to gravity, but how come gas
molecules even after having a certain mass in atm.
temperature and pressure not able to stay on ground.
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Answer Posted / harpreet singh , h.b.t.i
molecules of gases don't stay on earth though they have
mass bcoz of their lesser density the resultant of bouyant
force and gravitational force or weight of molecules is
acting in upward direction which make them to float above
earth's surface
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