An ink fountain pen leaks on high altitude, because

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The Pressure of the atmosphere is more than the pressure inside the pen

The Pressure of the atmosphere is less than the pressure inside the pen

The density of the ink on high altitude increases

None of these

answer is B.

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Detailed Solution

An ink fountain pen leaks at high altitudes because the pressure of the atmosphere is less than the pressure inside the pen.
We know the higher the altitudes, the lower the pressure.
Also, a fountain pen filled with ink contains some air at a pressure equal to the atmospheric pressure on the surface of the earth. When the fountain pen is taken to a higher altitude, where the atmospheric pressure is low, the excess pressure in the rubber tube forces the ink to leak out.

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