Multiple choice

Ink of a pen leaks in an aeroplane because ________.

  1. atmospheric pressure increases at heights

  2. pressure of ink inside the pen is more than the ambient pressure

  3. of higher speed of aeroplane

  4. of temperature difference
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

At high altitudes, cabin pressure is lower than ground level. The ink inside the pen was at equilibrium with ground pressure, so at reduced ambient pressure, the internal pressure exceeds external pressure, forcing ink out.

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