**1.823 pressure questions.**

In this picture the points on red have the same pressure because the weight of the fluid is the same above them. But according to pascal law the point on black must have the same pressure(both 3 ...

Similarly to thermodynamic pressure, when we have:
$$P_{therm} = (\frac{\partial U}{\partial V})_{S}$$
Can we define the mechanical pressure for a fluid as:
$$P_{mech} = \frac{\partial \psi}{\...

I do not understand why standing sound waves can be formed in a one-side or two-side open tube. Consider a one-side open tube.
In particular how does the reflection of the wave at the open end occur? ...

Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body ...

I have a test stand that is used for testing hydraulic pumps. We are adding a pump that we have never tested before and we are getting low flow readings. Will increasing piping to one size bigger than ...

I understand that the only reason liquids exist as liquids is because of the earth's atmospheric pressure and in vacuum they would all boil. But what is it that having an equal vapour pressure ...

Atmospheric pressure is the weight (Force) of the air per unit area. What will be the free body diagram of a water molecule be on the top of a liquid taking atmospheric pressure and vapour pressure ...

Why is the internal pressure against the nozzle body not included in calculating the anchor force? The attached picture shows all of the forces acting on the body. But I would assume the pressure on ...

I have some doubts on inverted U manometer.
In the picture there is one U inverted manometer, the space above the liquid in the manometer is filled with air which can be admitted or expelled through ...

To balance one phenomena, it is require to create same phenomena but with opposite sign. i.e pressure($\rm N/m^2$) in closed container balanced by creating stress($\rm N/m^2$) in walls. If it is true, ...

Prove it based on the ideal gas equation
$$\frac{1}{V} \frac{dV}{dT}P,n = \frac{1}{T}$$
$$\frac{-1}{V} \frac{dV}{dP}T,n = \frac{1}{P}$$

We usually prove that pressure is a function altitute Z. Imagine a cube in a fluid, then the force of pressure on the bottom surface is higher than the force of pressure on the top surface. But we don'...

I know that PV=nRT and this equation does not take mass into consideration. However P is also =Force/Area. And weight is a force which is equal to mg.
Will gas pressure be dependent on the mass of ...

If I decrease the volume of a certain container containing a gas; the KE of the particles will increase and therefore the temperature should increase. But according to Charles's law both of these are ...

Suppose I have a thin membrane sealed onto a flat surface along its perimeter, and there is water between the two surfaces with a certain pressure $P$. I would like to know, if I made a circular hole ...

I put nearly boiling water in a Thermos flask (trade name for a vaccuum flask for home use). Later when I unscrew the stopper, steam and droplets of hot water are forcefully sprayed out, proving that ...

I understand that pressure increases with depth in a liquid and that it is the difference in pressures at the top and bottom of an object submerged in a liquid that provides the buoyant force. What I ...

I was reading this question: Was Titanic's captain's decision correct? @oakad commented about a Russian vessel keeping itself afloat by going in reverse, using hydrodynamic pressure to keep ...

If I know the shape of a body, pressure and shear stress distribution over it, how can I calculate the total drag acting on it ? More exactly, can I calculate it this way:
Drag = [Pressure difference ...

If I am given the average kinetic energy of the molecules of a gas or a liquid, how can I tell if the fluid will burn me/crush me/both if I immerse my hand in it?
Equivalently, what is the difference ...

If we use Bernouill's law to compare pressure between point 1 and point 2, we find that P(2)gdH=0, we conclute P(2)=P(1).
I must have made a mistake but where is?

I have a hard time to wrap my head around pressure in the Navier-Stokes equation! It may sounds ridiculous but still I cannot understand the true meaning of pressure in the Navier-Stokes equation. Let'...

One of the common explainations involve a cylindrical flask filled with fluid and Newton's second law. But such explainations is specific. What could be possible explanation in a case in which the ...

I've seen in many movies and programs the event where a car plummets off the road and in to a body of water, sinking rapidly. The car slowly fills with water as it sinks and the occupant(s) don't ...

We seem to have two conflicting measures of pressure in a Venturi siphon open to the atmosphere,$\hspace{100px}$.
Bernoulli's principle says that, by energy conservation for a steady flow $Q$, the ...

I have a vacuum that shows a max vacuum gauge reading of 23"Hg when connected to a chamber. When placing room temperature water inside vacuum, the water doesn't boil.
I have seen this chart before ...

There is a pipe of 32mm in diameter. Water flows from left to right.
There are two branches in that pipe. To one of them connected input of water heat exchanger, to another - output of water heat ...

I have assembled a small DIY drip-irrigation system for my terrace garden. Please have a look at the attached image.
I switch on a small pump to start the drip-irrigation system and then switch it off....

Specifically, I am trying to wrap my head around this scenario but can't do so solely by thinking about the weight of the fluid.
Imagine a perfectly still lake. If you dive into the lake, the ...

I need help. I would like to know: what the differences between the jacks illustrated below are and with which jack a car can be lifted easiest (according to the answer sheet it is jack **B).**
My ...

So a friend jokingly said "there's no force in the universe stronger than two 5 gallon buckets that are stick together." And I thought that this has to have a wonderfully complex and scientific ...

I cannot understand the concept of fluid pressure.
Consider a liquid molecule at some point inside a liquid vessel. All the other molecules which are in contact with this molecule will exert normal ...

I have a physical picture of hydrostatic pressure ($dp/dh = \rho g$) in liquids, interpreting it as the weight of the water column.
Now in a gas, the molecules are much further apart than in a liquid....

I'm having a difficulty deriving hydrostatic pressure.
To be specific, I don't understand this image from Wikipedia:
How does the fluid below act on the below surface?
Is it the normal force? Or ...

I'm almost 100% positive it would decrease, but my meteorology professor (who also teaches physics) says it will stay the same, because no air is escaping the balloon!
Does the rubber of the balloon ...

I have the following problem where I need to apply Bernoulli's equation to find the velocity at the end of a tube that is attached to a hole of tank (filled with water), like it is illustrated in the ...

Is the soundpressure, which is created by air movement, the same as if it is created by sounds? If you use a microphone with a pop filter and without a pop filter and you blow into it, than there is a ...

There are types of quantum fields in the universe like spinor, vector, tensor, scalar fields.
Do these fields with energy stored in it (as energy density) usually exert pressure, or be pressureless?
...

If we consider a cube( with a density d) floating on a surface of a liquid( with a density d') and we want to evalute the difference of pressure between y1 and y2 (those 2 points are on the emerged ...

If two fluids are flowing at unequal velocities towards each other in a circular pipe, will a pressure be generated at the intersection? If yes, what will the direction of this pressure generated and ...

When looking at a graph of comparing temperature and specific volume, we see that for increasing pressures, the boiling point increases and that the length of the saturated liquid-vapor line decreases....

Imagine this little though experiment with me for a moment.
A piston sort-of contraption - like a bicycle pump, but without any nozzle to push air out of. One foot tall, one inch width/depth. Lets ...

Does tire pressure measured by a meter on tire gauge change with load? (I am not interested in pressure produced by car tires onto the road).
Car spec usually says "inflate to 220kPa normal load, ...

It says in my textbook that pressure is a vector. So how does it act both in the up and down direction in the same body of water as seen in this image?

During isothermal compression of water vapor (below critical temperature), the pressure increases initially, and then remains constant up to certain point, and then steeply increases with small ...

Can the Biot poroelasticity coefficient $\alpha$ be approximated as a function solely of porosity $\phi$, and if so then how (and under what conditions)?
I've read (e.g. 2.02-3 here) that it can, ...

Suppose I have 2 fluids of different densities, and I pour the same mass of each fluid into 2 identical cups. I feel like I'm confusing myself here â€” on one hand hand, both cups contain the same mass ...

I have a gas or a liquid in a container. Can I increase its pressure with sound waves or ultrasound or something? What I have in mind is that I can find the resonance frequency and make the molecules ...

I have a pipe. At its end I have mounted pressure meter. Of course there is no circulation. Water pressure meter is a kind of stopper for water.
I know diameter of the pipe, and I know its pressure in ...

Let us consider the enthalpy as a function of temperature and pressure, such that $H = H(T,p).$
Now, say we want to exchange the pressure $p$ by the volume $V$ by performing a Legendre transformation....

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