Pressure in Fluids - GCSE Physics Revision

Рет қаралды 9,022

Күн бұрын

Пікірлер: 12

@nicholaschan4257 2 жыл бұрын

This channel is so underrated. Explanations are clear and straightforward. Illustration are clean. I will recommend this to all my students. Hope I don't go out of job after.

@misswetton 2 жыл бұрын

Thanks so much! 😁

@mrK29011 2 жыл бұрын

I'm a medical student now but your videos are so so helpful for revising over old topics when tackling more advanced problems. I can't stress this enough to those taking GCSE how important these topics are! If you ever feel like giving up just remember I was in your position once and got through it also as you can see I'm back going over GCSE whilst doing a medicine and surgery degree! Never forget to be kind to yourselves kids and take breaks. Keep up the good work Miss😊😊!!

@misswetton 2 жыл бұрын

👏🏻 Thankyou so much! 💜

@nathanhumphreys9810 2 жыл бұрын

Great video!

@mohammedyasir9276 2 жыл бұрын

Your videos are so helpful and deserve wayyy more views

@misswetton 2 жыл бұрын

Thanks so much!

@thee_pauline 2 жыл бұрын

Thank you soo much❤

@shaunak3727 Жыл бұрын

nice vid

@mddelman 6 ай бұрын

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!

@tahafarooq2927 3 ай бұрын

This scenario describes the behavior of a simple fluid system governed by principles of hydrodynamics, particularly related to pressure and flow rate. When you open the hole at the bottom of the cylinder, the water inside the cylinder doesn't start flowing immediately. This is because there's no outlet for the air to enter, and the pressure inside the cylinder remains equal to the atmospheric pressure outside. So, initially, there's no pressure gradient to push the water out. When you briefly open the hole at the top, you create an opening for air to enter the cylinder. This allows the pressure inside the cylinder to equalize with the atmospheric pressure. However, since the water level is above the hole, water starts to flow out due to the pressure difference created by the weight of the water above the hole. The rate at which water flows out depends on the height of the water column above the hole and the area of the opening. This flow rate can be calculated using Torricelli's law, which states that the velocity of efflux of a fluid from a hole in a container is equal to the square root of twice the acceleration due to gravity multiplied by the height of the fluid column above the hole. When the cylinder is two-thirds full, the water column above the hole is higher compared to when it's one-third full. Hence, the flow rate is higher in the former case than in the latter. When you close the hole at the top, you're cutting off the supply of air, and the pressure inside the cylinder starts dropping again as water flows out. The rate at which the pressure drops depends on factors such as the height of the water column and the rate of water flow. Eventually, the pressure inside the cylinder drops low enough that the force due to atmospheric pressure on the surface of the water outside the cylinder prevents any further flow. The time it takes for the flow to stop depends on various factors including the volume of water, the size of the hole, and the height of the water column. Im not sure if this helps but i tried 😀

@mddelman 3 ай бұрын

@@tahafarooq2927 Thanks so much for taking the time to reply. Yes, it’s a little technical, but I think I understand the phenomenon better now. All the best, M