@parth-the-artist
The pressure at the level of blue straw must be Patm This means that when orange straw is deep inside, the level of air in the orange straw is the same as level of blue straw The pressure above water surface at the top is less than Patm Psurface +hdg = Patm Where d is the density and h is the height. In this situation, if water were to fall from blue straw, height of water in the bottle would decrease. This would lead to increase in volume inside the bottle which is occupied by air. So the pressure there would decrease and since Psurface and h both decrease, the pressure at the blue level would decrease, which contradicts that water flows outside from blue straw. If orange tube is lifted, the air from outside is allowed to reach the top of bottle and hence Psurface would increase, which allows water to drip
@DMWZOHAN
It starts pouring once the bottom of the orange straw is lifted above the blue straw. (Is this the case regardless of height?) my guess is the water pressure in the orange straw, once lifted above the perpendicular blue straw, is low enough that the water trying to escape has greater pressure than inside the orange straw and is thus able to pull the air through the orange unlocking the water. It makes sense in my head at least
@CotillonPARTEI
Orange straw is closed at top and had a hole on side. When in lower position, hole is inside bottle and system is close. When orange straw is up, the hole is.out of bottle and the air can enter and water is displaced.
@androguyperson2297
Blue straw is filled with water, it’s shorter. So (B) now we add a definition to water flow (F) Orange straw is vertical with two opposing densities of material (water/air) F = B - (A / W) Probably not right but I’m doing this on my phone. Basically a vacuum(suction) is formed by the water draining out of the blue straw, when mass of water in Orange straw exceeds that within the blue straw the flow is eliminated. Basically the amount of water in the orange straw exceeds the pull of gravity… probably easier to draw out on paper.
@laurentoutan9922
@PhysicsNinja c'est parce que le point d entrée d'air de la paille est plus bas que le point d'écoulement et il y a trop de pression d eau plus bas et ça empêche de couler
@BinethMinthusa
If we look at the bottom of the orange straw, due to height difference the pressure exerted at the bottom also changes. And if we assume that theres a constant air pressure, then we can say that the differemce of pressure makes it possible for air bubbles to come into the bottole through the straw.
@ChaineYTXF
This particular book deserves respect😢
@Zuexis1
Air coming out of orange straw when lifted displaces water, therefore forcing water out of the blue straw. When orange below the blue straw a pressure seal is created due to the blue being above creating a low pressure zone within the blue straw.
@Mopharli
When the orange straw is high, the water flow is intuitive. When it is low, it is less so. The question then should be why doesn't air enter the blue straw and glug out like a normal bottleneck until the water level is at the same as the blue straw. I believe it is the capillary action/water surface tension against the internal sides of the blue straw being just enough to overcome the weight of the water above the blue straw line. Not too dissimilar to keeping the water surface tension in place in the magician's trick of an upturned bottle or cup.
@bambo3267
Assuming there is no slight of hand tricks here if the orange straw botom opening is below the blue one and it shoots water out it would be illogical since the pressure would be lower than atmosphere below the blue straw and it shouldnt push water out which is what happens and when you lift it up it works there is a sweet spot when the friction in tube equals the delta pressure of the column of water between the two tubes and the difference of atmosphere that is the lowest point and it reaches a maximum when you place the orange straw in the air above as that would make the whole delta maximum in this experiment tldr: pressure cannot be negative under blue straw as that wouldnt make water shoot out
@steamer1
Just water pressure changes as the orange straw is moved. When below the level of the blue straw, the water pressure holds back the intake of air into the bottle, holding the water back. As the orange straw is lifted above the level of the blue straw, the pressure holding back the intake of air is reduced, allowing gravity to do it's party trick.
@joshuahchristenbury7371
It depends on where the waterlevel is inside of the orange straw. If its higher than the rest of the glass it creates headpressure and causes more force downhill. But once you return the equilibrium then the pressure is stablized and the presume the previous conditions which in this case is a vacuum seal caused by the person who inserted the straws
@Miky008
Difference in weight of water when above the blue straw and when below it.
@terranovarain6570
With the straw below the out flow the air coming in has to overcome more force than is created by the water trying to pour out
@siliconsight
Air should displace water for it to flow outside through the blue straw. Water pressure (proportional to the height of water column) at the orange straw's end should be lesser than at the level of blue straw to allow air to be sucked in. You can force blow air into orange straw when it is below the blue straw to have the water flow out.
@turboks1
Critical pressure differentiation point at the blue straw.
@gothesouthway
Better question is why doesn't the water pour out all the time. Maybe something to do with opposing pressures both inside and outside the bottle and the weight of the liquid?
@abundantharmony
Gravity wants to pull the water out of the system but the deeper water's pressure (because of it's weight) is high enough to push back up through the vertical straw to resist it.
@grimtapestry5585
I dont know the exact mechanism, but the pressure is different when the bottom of the orange straw is above the blue one vs underneath it. My guess is the air cant overcome the water weight, so nothing can get in to displace the water "trying" to exit the blue straw creating a pressure seal.
@Alkatross