Ink comes out from a fountain pen in an aeroplane because air pressure decreases with increase in altitude. As the plane ascends, the surrounding air pressure decreases, causing the air inside the pen to expand. This expansion can force ink ...
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Ink comes out from a fountain pen in an aeroplane because air pressure decreases with increase in altitude. As the plane ascends, the surrounding air pressure decreases, causing the air inside the pen to expand. This expansion can force ink ...