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Pressure in Fluids and Atmospheric Pressure — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSPressure in Fluids and Atmospheric Pressure2 Marks
Question
Why does a fountain pen leak at high altitude?
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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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