Suppose you drink a liquid through a straw. Explain why the liquid moves upward, against gravity, into your mouth.
Answer to Problem 1CQ
Explanation of Solution
As the liquid is sucked through the straw negative pressure is created in the mouth and the top of the straw which is less than the atmospheric pressure. The lower end of the straw and the liquid are at atmospheric pressure. Due to the pressure difference between the both ends of the straw, the liquid flows from higher pressure to lower pressure so the liquid moved upward against gravity when sucked through the straw.
Conclusion:
Therefore, the liquid moves upward, against gravity into the mouth through a straw due to the negative pressure created inside the mouth and upper end of the straw.
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