It's simple, but i don't know it happens

  • Context: High School 
  • Thread starter Thread starter orlandu
  • Start date Start date
Click For Summary
SUMMARY

The discussion centers on the physics of fluid dynamics as demonstrated by the behavior of water in a straw. When a straw is immersed in water, the water level inside the straw equilibrates with the external water level. Blocking one end of the straw creates a vacuum that retains the water when the straw is pulled out. Upon release, the water falls due to gravitational force, illustrating the principles of pressure difference and vacuum formation in fluid dynamics.

PREREQUISITES
  • Basic understanding of fluid dynamics
  • Knowledge of pressure concepts
  • Familiarity with vacuum formation
  • Experience with practical demonstrations of physics principles
NEXT STEPS
  • Research the principles of fluid dynamics in detail
  • Explore the concept of pressure differentials in liquids
  • Study vacuum creation and its effects on fluid behavior
  • Investigate practical applications of fluid dynamics in everyday scenarios
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding the fundamental principles of fluid behavior and pressure dynamics.

orlandu
Messages
3
Reaction score
0
When you immerse a straw in water, the water flows into the straw and the level will be the same as the level of water outside the straw. If you block the hole of the straw, you can pull out the straw and the water will be 'stuck' in the straw as long as one end of the straw is blocked. When you release it, water will soon fall down. I can guess that this has to do with difference in pressure, but not sure how it actually comes about. Can someone enlighten me?
 
Physics news on Phys.org
orlandu said:
When you immerse a straw in water, the water flows into the straw and the level will be the same as the level of water outside the straw. If you block the hole of the straw, you can pull out the straw and the water will be 'stuck' in the straw as long as one end of the straw is blocked. When you release it, water will soon fall down. I can guess that this has to do with difference in pressure, but not sure how it actually comes about. Can someone enlighten me?

If the water tries to fall out of the straw, a vacuum is created, and the water gets sucked back in.
 
I tried, but I can't imagine a more concise, clear, vulgar, truthful, understandable, layman explanation than Mk's. Beautiful.
 

Similar threads

Undergrad What Keeps Water in a Straw When It's Removed from a Glass?
  • · Replies 12 ·
Replies
12
Views
6K
Graduate Height of Water in Straw vs. Time
  • · Replies 3 ·
Replies
3
Views
2K
Problem Set Involving Inertia and Balloons
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Can a 1 kilometer giant straw function like a regular straw?
  • · Replies 1 ·
Replies
1
Views
3K
High School How do I keep my room cool when my housemate wants the heating on?
  • · Replies 15 ·
Replies
15
Views
4K
High School Why does this not produce water pressure?
  • · Replies 9 ·
Replies
9
Views
671
High School Will there be water coming out of the last hole?
  • · Replies 17 ·
Replies
17
Views
2K
High School What actually is static pressure?
  • · Replies 11 ·
Replies
11
Views
4K
High School Pumping water upwards into a large water tank
  • · Replies 6 ·
Replies
6
Views
3K
A water-bottle demonstration of atmospheric pressure
  • · Replies 6 ·
Replies
6
Views
2K