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    Question

    Why does a fountain pen leak on an airplane flying at high altitude?

    A Due to reduced viscosity of the ink Correct Answer Incorrect Answer
    B Due to increased viscosity of the ink Correct Answer Incorrect Answer
    C Due to higher atmospheric pressure outside the pen Correct Answer Incorrect Answer
    D Due to lower atmospheric pressure outside the pen Correct Answer Incorrect Answer

    Solution

    The lower atmospheric pressure outside the pen at high altitudes causes the higher pressure inside the pen to force the ink out.

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