U-tube: Water Rises Slightly - Get Help on the Right Track

Thread starter hansel13
Start date Feb 3, 2009
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Density U-tube

AI Thread Summary

Blowing across the top of one arm of a U-tube creates a difference in air pressure, causing the water in that arm to rise slightly. This phenomenon is explained by Bernoulli's principle, which states that an increase in the velocity of air results in a decrease in pressure. As the air moves faster over the top of the tube, the pressure decreases, allowing the water to rise in that arm. Understanding the relationship between air velocity and pressure is crucial for grasping this concept. The discussion emphasizes the importance of air pressure dynamics in fluid behavior.

Feb 3, 2009

hansel13

Homework Statement

A person blows across the top of one arm of a U-tube partially filled with water. The water in that arm...?
The answer is rises slightly: The water in that arm rises slightly.

I really couldn't figure out why. Could someone help get me on the right track?

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Feb 3, 2009

Carid

What do you know about air pressure, and how does that pressure depend on the velocity of the air?

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