due to less dense air and decrease in g
the pressure of the ink in the capillary of the fountain pen being more than that of the atmospheric pressure in high altitudes leaks out( flows from high pressure to low pressure)
The atmospheric pressure decreases with altitude because gas molecules which make up the air concentrate near lower altitude in response to Earth’s gravity. Hence, air pressure is low at higher altitudes.
so fountain pen leak inside an aeroplane in higher altitude .
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↪ Pressure is less at higher altitudes.
↪ The pressure exerted by the ink on the walls of the pen is greater than the outside pressure.
↪ As a result, low pressure is created outside. To fulfil the low pressure, the ink leaks from the pen.
because the pressure is comparatively less, so to equalise the pressure differences ink start moving out from the pen which have a relatively high pressure.
HEYA MATE HERE'S YOUR ANSWER ⬇️
A fountain pen filled with ink contains some air at a pressure equal to atmospheric pressure on earth's surface. When pen is taken to an altitude, atmospheric pressure is low so the excess pressure inside the rubber tube forces the ink to leak out.
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Here's your answer!
A fountain pen leaks inside an aeroplane in higher altitude. Why?
This is because -
Ink contains dissolved air inside and some air is also there inside the fountain pen under normal pressure. When this fountain pen is carried in higher altitude, (as the outside air pressure is low), the air inside, tries to come out and as a result the liquid or ink is pushed out (it leaks).
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i hope it will hepl u