1.

Passengers travelling in an aeroplane are advised not to carry fountain pens because at higher altitudes,

Answer»

ink VAPOURIZES DUE to high EXTERNAL pressure.
solidification of ink takes places due to very low external pressure.
pressure within the tube is more than the external pressure and causes leakage of ink.
pressure within the tube is LESSER than the external pressure and causes leakage of ink.

Answer :C


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