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Physics

Questions tagged [pressure]

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This tag is for questions relating to pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.

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1answer
77views

IntroductionI've been doing some research on this topic and I want to:Confirm my findingsAnswer some lingering questionsPremiseImagine we could magically / instantly create a void in the ...
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1answer
74views

Air with density ρ, absolute pressure P1 flows through a pipe with velocity v₁ and cross-sectional area A₁, and then enters a contraction with area A₂. A1/A2=10. We need to determine the pressure P₂ ...
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129views

I have a case where I have a system that can send compressed air (up to 6 bar) down a hose to an upside down bucket placed around 30 meters depth. The shape is more like an ellipse, but for this ...
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0answers
41views

If you ionize the gas inside a sealed container, giving it a net positive or negative charge, does the pressure of the gas on the walls of the container increase due to electric forces?If so, has ...
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1answer
82views

Imagine a cube is lying on a table. Then the forces acting on it are: $mg$, $N$, but also the atmospheric pressure. It presses on the top and the side faces. It doesn't press on the bottom face since ...
2votes
1answer
120views

In $3D$ the grand potential $\Omega = -PV$ has a well-defined physical meaning. But for $2D$ systems what would $\Omega$ actually mean physically? Dimensionally speaking it looks like $\Omega = -\...
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1answer
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Hereinafter, the term “fluid” will be used to mean “ideal fluid” (i.e., an incompressible fluid without friction).The fluid flows to the right through a horizontal pipe at a speed $v$. Then Bernoulli'...
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29views

we know Force is a vector.When a vector is multiply or divided by scaler we got also vector.We defined pressure as Force/area ; area is a scaler.Then why Pressure is not a vector?
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I am studying fluid dynamics and there is a section in our textbook that handles fluids at rest. It starts by mentioning that for fluids at rest ($\vec{v}=0$) the sheer stresses have to vanish and ...
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2answers
136views

This question may sound stupid. Consider a system at equilibrium. If we use the canonical ensemble, then the pressure of the system is(if I'm right) $$p=-\sum_s {p_s \frac{\mathbb d E_s}{\mathbb d V}},...
-2votes
1answer
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I’m thinking of building a CRT (I believe it can be done), but I’ve hit a snag.I am planning on using either a 1000 mL or 2000 mL Erlenmeyer flask made out of borosilicate glass (Pyrex) for the tube. ...
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84views

This may be an incredibly basic question, yet i am unable to understand as why speed of sound is independent of pressure. as according to me as i understand when increasing the pressure , density ...
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1answer
94views

I'm not entirely sure if this is the right stack but here goes.I'm trying to design a fictional planet that has less gravity than Earth but I would like to give it an atmosphere as or even more dense ...
1vote
1answer
38views

The situation is shown in this image. I have to find the net force by the two liquids on the left curved surface of the cylinder.I tried this - if we consider a section of height $dx$, immersed in ...
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I have a question about fluid dynamics that is causing some confusion for me. It relates to the pressures at play when priming a siphon.The Setup:Imagine two identical tanks, Tank A and Tank B....

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