I wonder if the pressure changes if you let something float in a pool of water and the pool has an opening at the bottom that you cover with your hand?
I would like to know if it is strenuous for me as a human being to hold a hole there 😅
(3 votes)
Loading...I bought one on Amazon but I think it was more designed to support as much weight as possible. I need one with an inner diameter of 3cm because I want to put it horizontally on something. It has to be ring-shaped. Of course it also has to be able to withstand a few grams,…
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The pressure depends on the water column when it is increased by the propellant, this pressure increases with ~0.1 bar per m water column.
And how exhausting it is to keep a hole depends less on the pressure and much more on the surface of the hole.
1 bar, that is to say 10 m water column, are unproblematic in a tube with an inner diameter of 1 cm and correspond to a force of approx. 7 N or 0.7 kg. But if the hose has 5 cm DM, it’s 200 N, it’s already a little more force you have to put on (ca 1 box of beer).
I hope I just didn’t roughly calculate myself, pressures are always a little unintuitive, so you’ll quickly get a lot of weight.
The hydrostatic pressure is p=ρgh. Now, if you leave any material on the water, it is sometimes immersed in the water, the water level h rises accordingly, and you calculate the new pressure with the same formula but again. Because the mass of the floating body naturally produces new weight, which flows into the pressure p=F/A.
If the reference state is 0 Pa. Otherwise + ambient pressure in the hydrostatic basic equation
This depends on the size of the basin. What “driving” does not matter. It is only the Height of the water levelwhich is taken into account. The force now depends on the pressure of the water column and above all on the surface of the hole. Small holes are not a problem. It becomes difficult when the hole gets bigger…
The success during manual closing of the drain opening depends on the size of the residual opening and the geostatic pressure at the drain.
The geostatic pressure at the drain opening rises with the water column above it. With a given surface area, this column increases with the volume of the displaced liquid by floating bodies placed on it.
When you throw an object into a basin, the water level rises. This also increases the pressure on the ground.
The pressure of the water does not change