B The Mysterious Water Bottle: Uncovering the Physics Behind It

  • B
  • Thread starter Thread starter Einstein60
  • Start date Start date
  • Tags Tags
    Physics Water
AI Thread Summary
When the valve at the top of the bottle is open, air pressure allows water to flow out through the small hole at the bottom. Closing the valve creates a vacuum effect, preventing water from flowing out because air cannot enter to replace the water. If the valve remains open, air can flow into the bottle, maintaining pressure balance. Closing the valve while water hypothetically continues to flow out would decrease air pressure above the water, leading to a potential vacuum. Understanding these principles of air pressure and fluid dynamics is key to grasping the behavior of the water in the bottle.
Einstein60
Messages
18
Reaction score
2
Today, I filled a bottle with water and I created a small hole beneath the bottle on the side. I realized that if I open the cock of the bottle, the water flowed out of the hole but if I close it, the water stopped flowing. WHY?
 
Last edited:
Physics news on Phys.org
As I understand it, you have a bottle with an opening at the top and a valve on the opening.

You have added a small hole at the bottom (small enough so that air does not bubble in through it). You notice that when the top valve is open that the water flows freely out the bottom. But if you close the valve at the top, water no longer flows out.

If you leave the valve open at the top, does anything flow into the bottle through the opening?

If you close the valve, what happens to the air pressure in the bottle above the water if some water, hypothetically, continues to flow out the hole?
 
  • Like
Likes vanhees71 and berkeman
jbriggs444 said:
As I understand it, you have a bottle with an opening at the top and a valve on the opening.

You have added a small hole at the bottom (small enough so that air does not bubble in through it). You notice that when the top valve is open that the water flows freely out the bottom. But if you close the valve at the top, water no longer flows out.

If you leave the valve open at the top, does anything flow into the bottle through the opening?

If you close the valve, what happens to the air pressure in the bottle above the water if some water, hypothetically, continues to flow out the hole?
Can you please explain further
 
Einstein60 said:
Can you please explain further
Can you answer either question?
 
  • Like
Likes vanhees71
No
 
  • Skeptical
Likes Motore
Einstein60 said:
No
You will do better here if you make an effort. We're here to teach, not to spoon feed.
 
  • Like
Likes vanhees71 and jbriggs444
russ_watters said:
You will do better here if you make an effort. We're here to teach not, not to spoon feed.
Okay.
 

Similar threads

I Pressure: Sealed bottle physics
Replies
29
Views
4K
A water-bottle demonstration of atmospheric pressure
Replies
6
Views
2K
B Pumping water upwards into a large water tank
Replies
3
Views
2K
I Surface tension and water (the smallest hole water will flow through)
Replies
1
Views
5K
I How can visible gas bubbles remain intact inside frozen water?
Replies
8
Views
1K
I Variation of Torriceli's theorem?
Replies
3
Views
1K
I Pressure builds on its own inside this water tank?
Replies
21
Views
3K
B Fluid Flow Deflection Bending Ahead of Airfoil?
Replies
7
Views
2K
Compressing a bottle with water - initial velocity of water
Replies
1
Views
1K
Rate of water flow experiment question
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top