The discussion revolves around understanding the mechanics of a Heron's fountain, specifically focusing on the variables that influence the height of the fountain. The original poster has constructed a fountain and is exploring the relationship between pressure and height in the system, particularly in relation to the bottles and tubes involved.
The discussion is ongoing, with participants providing guidance on defining heights and pressures. Some participants are exploring the implications of changing heights on the fountain's operation, while others are questioning their understanding of the relationships involved. There is a recognition of the complexity of the problem, and participants are encouraged to clarify their assumptions and reasoning.
Participants note the importance of specific heights in the setup, such as the top of the tube and the water surface levels in the bottles. There is an acknowledgment of potential confusion regarding which heights are relevant to the pressure calculations, as well as the impact of viscosity and tube width on the fountain's behavior.
Atmospheric pressure is a background common to all points. We only need concern ourselves with gauge pressure, i.e. the excess above atmospheric.Physicist1011 said:Oh the pressure at A is atmospheric pressure so the difference in pressure between B and A is PB=Patm
As I reminded you, we are considering a static arrangement. Your finger is stopping the fountain, so nothing is actually passing anywhere.Physicist1011 said:Well the water in B passes through a tube of water and comes out into air. So neither of those things you mentioned above happen because the water passes through water (in B) and then air (coming out of the tube d).
Which tube? They are labelled.Physicist1011 said:Yes, the water is flowing in the tube to the 2nd surface so the medium does not change since the path is the same medium on both surfaces.
As I wrote in post #59, tube d connects reservoir B to the base of the fountain. It does not connect with reservoir A. There is no water path from the surface of reservoir B to the surface of reservoir A.Physicist1011 said:tube d
That connects the airspaces at B and C, not A and B..Physicist1011 said:Oh, tube e - tube of air connecting to 2 air mediums.
Yes, A and C, not A and B.Physicist1011 said:ok. tube f is a tube full of water which connects a water medium to another water medium.
Ok.Physicist1011 said:oh sorry tube d definitely isn't one.
Right.Physicist1011 said:B and C are of the same pressure.
No, remember that we are supposing you have a finger on top of that tube, so the fountain base is isolated from the atmosphere.Physicist1011 said:The base of the fountain connects from b into the atmosphere - through both water and air.