Very informative video, thanks. Do you have time to answer a question for me? I have a cylinder filled with water, There's a small hole in the top that I can open and close. There's a hole in the bottom that I can open and close, just to control whether or not water is released. If both holes are closed, obviously no water is released. If the cylinder is filled to the top and I open the bottom hole, no water is released until I open the hole at the top. If I open the top hole very briefly, some water is released but stops very quickly after I close the hole at the top. If the cylinder is only two-thirds full, the flow continues for a longer amount of time after I close the top hole. If it's one-third full, it takes an even longer time to stop flowing. Can you tell me why it works this way? I'd be most appreciative if you can answer this question. Thanks very much!
Assuming the cylinder is sealed (as in it is not continually open with no 'lid') Both Holes Closed: When both the top and bottom holes are closed, no water flows out due to the lack of an outlet and the absence of air entering the cylinder. Bottom Hole Open, Top Hole Closed: With the bottom hole open but the top hole closed, no water flows out because the air pressure outside the cylinder and the air pressure inside it are balanced. There's no additional pressure to push the water out. Opening the Top Hole Briefly: When you open the top hole briefly, you momentarily allow air to enter the cylinder. This disrupts the pressure balance, and water starts to flow out of the bottom hole due to gravity. However, as soon as you close the top hole, the air pressure inside the cylinder decreases because some water has left, creating a partial vacuum. This vacuum counteracts the force of gravity and stops the water flow quickly. Cylinder Two-Thirds Full: If the cylinder is two-thirds full, opening the top hole briefly allows more air to fill the space above the water compared to when the cylinder is full. This means that, after closing the top hole, the partial vacuum that forms is less powerful (since there’s more air to fill the space left by the exiting water), allowing the water to flow for a longer time before it stops. Cylinder One-Third Full: Similarly, when the cylinder is only one-third full, there's even more air above the water. So, the partial vacuum created after closing the top hole is weaker still, allowing the water to flow for an even longer time. In summary, the duration of the water flow after closing the top hole depends on the amount of air inside the cylinder. More air leads to a weaker vacuum after closing the top hole, which allows the water to flow for a longer period. This is a fascinating demonstration of how air pressure and fluid dynamics interact.
I have a question. Does the amount of pressure affects the amount of water coming out? Supposed all holes are exactly the same, does hole C release a greater amount of water than hole A? Thanks in advance
Very well illustrated
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Most welcome 😊
Most welcome 🤗
Very nice
It means that if height increases inside fluid pressure is also increased
Very informative video, thanks. Do you have time to answer a question for me? I have a cylinder filled with water, There's a small hole in the top that I can open and close. There's a hole in the bottom that I can open and close, just to control whether or not water is released. If both holes are closed, obviously no water is released. If the cylinder is filled to the top and I open the bottom hole, no water is released until I open the hole at the top. If I open the top hole very briefly, some water is released but stops very quickly after I close the hole at the top. If the cylinder is only two-thirds full, the flow continues for a longer amount of time after I close the top hole. If it's one-third full, it takes an even longer time to stop flowing. Can you tell me why it works this way? I'd be most appreciative if you can answer this question. Thanks very much!
Assuming the cylinder is sealed (as in it is not continually open with no 'lid')
Both Holes Closed: When both the top and bottom holes are closed, no water flows out due to the lack of an outlet and the absence of air entering the cylinder.
Bottom Hole Open, Top Hole Closed: With the bottom hole open but the top hole closed, no water flows out because the air pressure outside the cylinder and the air pressure inside it are balanced. There's no additional pressure to push the water out.
Opening the Top Hole Briefly: When you open the top hole briefly, you momentarily allow air to enter the cylinder. This disrupts the pressure balance, and water starts to flow out of the bottom hole due to gravity. However, as soon as you close the top hole, the air pressure inside the cylinder decreases because some water has left, creating a partial vacuum. This vacuum counteracts the force of gravity and stops the water flow quickly.
Cylinder Two-Thirds Full: If the cylinder is two-thirds full, opening the top hole briefly allows more air to fill the space above the water compared to when the cylinder is full. This means that, after closing the top hole, the partial vacuum that forms is less powerful (since there’s more air to fill the space left by the exiting water), allowing the water to flow for a longer time before it stops.
Cylinder One-Third Full: Similarly, when the cylinder is only one-third full, there's even more air above the water. So, the partial vacuum created after closing the top hole is weaker still, allowing the water to flow for an even longer time.
In summary, the duration of the water flow after closing the top hole depends on the amount of air inside the cylinder. More air leads to a weaker vacuum after closing the top hole, which allows the water to flow for a longer period. This is a fascinating demonstration of how air pressure and fluid dynamics interact.
Thanks so much for your quick and very detailed and informative reply! @@NGScience
I have a question. Does the amount of pressure affects the amount of water coming out? Supposed all holes are exactly the same, does hole C release a greater amount of water than hole A? Thanks in advance