Liquid Definition and 1000 Threads

I've seen the standard derivation of the expression for liquid pressure P = dgh where, d = density of the liquid; g = acceleration due to gravity; h = height of liquid column in many textbooks has been done by using a specific example of a cylindrical vessel. In such a case, the geometry of the...

What are the factors affecting dispersion of salt in a mixture? Obviously stirring will guarantee effective mixing, but I'm wondering how much I could expect the salt to disperse throughout the stew if I were to not touch it. The stew is near/at boiling (100 C), but it is not vigorously...

Hi all, i have a problem here I need to solve asap. Homework Statement I need to find out the Time it takes for 6900 gallons of WATER to go from: 55 deg F. to 32 deg F. 55 deg F. to 20 deg F. ambient air set at 20 deg F. if needed The heat loss rate is 750 Btu/Hr/degF. Homework Equations...

I have three different liquids l1, l2 and l3 stored for 10 days. The liquid are required to be kept in temp x1, x2 and x3. As input i have following: 1) daily temp of all three liquids 2) daily qty i need to keep temp of all three liquid constant - to do that heating is done. Due to...

ElectroMagnetic Wave In Liquid.. Help with Index of Refraction?? Homework Statement Consider the propagation of an electromagnetic wave in some liquid. The y-component of its electric field is given by Ey(x,t)=4.3 x104 V/m sin(5.40E-2m-1x + 6.00E+0 x106 s-1 t). How large is the index of...

I am researching flow through blister packs and trying to derive an equation that can relate flow rate to a plunger position. If I cannot describe the problem well, I will upload a picture that can give a better idea. I have an igloo shaped blister pack made of aluminum foil. A plunger moves...

Hi, Homework Statement A square frame with a thin crust/layer of liquid with surface tension γ is given. Into the plane of the frame an elastic wire of circular shape with radius r_0 is inserted. The thin crust/layer of liquid is then burst (by pricking) and as a result of the force of...

Is there some liquid planets out there? well there are gaseous planets... what are the laws that avoid the existence of a giant liquid planet with a little rocky nucleus?

Hi, A liquid in rotation give two kind of forces: 1/ centripetal 2/ pressure forces (Fa, Fb in the drawing) I'm ok that centripetal forces can't give energy (we lost kinetics energy) but Fa/Fb seems in direction to external circle, why it's not possible to recover energy from these...

The pressure difference sure.The point where there is higher energy in order to attain lowest level of energy moves towards region of lower energy, but if this liquid is viscous enough, doesn't the whole energy get lost during flowing? then how is the pressure level or rather the energy level...

Hi guys, sorry if the question seems too basic or simple, but i can't seem to grasp the concept about pressure here. say, a cylinder filled with water; ------------ °A °B ------------ at point A, the liquid pressure is lower than it is at point B , as there's a...

1. A conveyor belt with one end immersed in a glycerin tank is used to transport small amounts of glycerin to a second tank. The belt surface is completely smooth, flow is laminar, and the specific weight of the fluid is 60 lbf/ft^3 with the belt velocity equal to 1 ft/s. Determine the volume...

Homework Statement A liquid is enclosed in a metal container that is provided with a piston of the same metal. The system is originally at a pressure of 1.00 atm (1.013*10^5 Pa) and at a temperature of 30.0 C. The piston is forced down until the pressure on the liquid is increased by 50.0 atm...

Hello, why the same quantity of different elements behave in the same way (take about 22,4 L) when they are gas and they don't when they are liquid ?

Hye everyone! An unknown thick-and-sticky green liquid was found leaked from 2 out of 9 feeders, of our 132 kV Switchgear. The liquid was leaked through the cable gland that connected to the Secondary Terminal Board insulating cap of the Current Transformer, at the GIS. I had done: 1)...

Homework Statement A rectangular swimming pool is 20 feet wide and 40 feet long. The depth of the water varie uniformly from 3 feet at one end to 9 feet at the other end. Find the total force exerted at the bottom of the pool.Homework Equations The force F exerted by a liquid of constant...

Hi, I've been working on an experiment where I dip LEDs into liquid nitrogen and note the color change. All online sources I've seen predict that the wavelength of the light emitted by the LED will decrease upon immersion. What I've been observing, however, is a sudden decrease in...

Homework Statement A small cylindrical test-tube of inner radius R is initially filled with a liquid up to height ##h_0##. The tube is connected by a long rope of length ##L## (##L»h_0##) and swinging horizontally with a constant angular velocity ##ω##. There is a tiny round hole of radius...

I have two questions for you guys A) what is the electrical resistance per meter of Liquid Nitrogen and B) What is the heat specific heat capacity of Liquid N.

I'm writing an essay on liquid crystal lasers and have written the intro to my paper. Can I just double check with you all that I haven't written anything that's wrong? Thanks. Please let me know if I should also post the source I used. It's the first time I've posted something qualitative so...

Homework Statement A massive cylindrical container of inner radius ##R## is rotating freely with an initial angular velocity ##w_0##. A liquid of density ρ is slowly injected into the container, until the container is fully filled except the center of the container. The angular velocity of the...

I'm trying to find why this thermodynamics cycle is not possible but I don't find. The only problem for me is at step 3, the gas can't become a liquid but why ?

An 18-year-old teenager has had to have her stomach removed in an emergency operation after drinking a cocktail containing liquid nitrogen. http://www.bbc.co.uk/news/uk-19878511 Question? How does she eat food without a stomach? Carry a bag?

Homework Statement A U-tube has vertical arms of radii 'r' and '2r', connected by a horizontal tube of length 'l' whose radius increases linearly from r to 2r. The U-tube contains liquid up to a height 'h' in each arm. The liquid is set oscillating, and at a given instant the liquid in the...

In a liquid, when we use P=hρg, how do we take the h? I always thought that we take it from the bottom of the liquid but in a question, they showed that you can take it from the top so I'm pretty confused about this. Here is an example: http://postimage.org/image/oki3fq131/full/ So from this...

Hi, I am working with a droplet generation system that is designed to produce monodisperse droplets. A periodic disturbance of appropriate frequency (kHz) is applied to a piezoelectric ceramic, transferred to an orifice disk (fitted within the ceramic by means of a Teflon O-ring), then sent to...

Hi guys, I'm relatively new to physics, so please bear with me. :) Let's image we have a cylinder like this, filled with 8760 mm3 of liquid, with a nozzle on one end and a plunger on the other. An explosive charge goes off behind the plunger, releasing 45 joules of energy, and pushing the...

Maybe someone here will have an idea where I can get some information. I am planning on making liquid nitrogen from air and will need to regenerate waste gas. This gas will be very cold (-300F) and will get transported through some tubing system. Is anyone aware of any plastic tubing material...

Imagine that we have got some vessel under standard temperature and pressure filled with atomic Hydrogen inside and the electrons of these atoms have got the same spin and therefore they cannot join into Hydrogen molecules, so the process of recombination does not occur. Then we begin cooling...

If I had a black liquid that was thin, and I had a transparent liquid that was just lighter than the black liquid but didn't mix with the black liquid, and I put them in a dish out in the sun would the black liquid absorb the photons causing it to heat up and rise during the day, and cool down...

I am trying to determine the velocity of a liquid. The density of the liquid is .885 g/cm3. The pressure at which it is being forced is 17236.89 kpa. What else do I need to know? I am looking for a formula to help me in other calculations with different pressures and densities. Thanks in advance...

Has anyone done this as a DIY project? I want to use a refrigerator compressor with counter-current coils.

Hello There, So I made a plot of some specific heats in refprop, and I chose the "Draw Saturation Lines" option. When I did this, the follow chart was produced. http://i.imgur.com/h34Pq.png Now my question is, what are these saturation lines representing? -TP

Homework Statement That is the problem statement. I can't seem to get started on part a. For part b I can find the velocity profile of the viscous liquid form the equations of motion relating velocity and change in pressure, find the avg velocity, and find the change in pressure from...

Would it be true to say that boyancy, as in helium rising and liquids of different densities separating, with the densest at the lowest point, is an indication of gravity's natural tendency to attract the most dense mater to its centre point? If so is the Schwarzschild radius a natural...

Dear Physics Forum Users Commonly, the relative permittivity of liquid water is reported to be \epsilon_r = 78.0\epsilon_0, \epsilon_0 being the dielectric constant of the vacuum. For ice (solid water), \epsilon_r = 4 \epsilon_0 (heard it in a talk once). Is it correct to interpret the...

(that's Fahrenheit of course) For that matter...0 degree F aluminum cubes doesn't cool a room temp liquid as much. frozen H2O cools liquid off much much much much faster and more (in total temp drop terms) than equal surface area "cubes" of aluminum, cooled to -20C. (I've done the...

A test tube filled with water is being spun around in an ultracentrifuge with angular velocity. The test tube is lying along a radius and the free surface of the water is at radius r(o). Show that the pressure at radius r within the test tube is: p = .5(p)(angular velocity)^2(r^(2)...

So I work for a drilling company that stores oil in large cylindrical tank facilities. The total volume of each tank is 38,500 bbls. In each specific tank facility, a radar tank gauge sits atop a 10" pipe inside the main tank, measuring the level of the liquid inside the pipe. Usually, a...

Hi All, I tried to find entropy of liquid nitrogen in various data books, using nitrogen's CAS number, MSDS, but I was able to get the entropy of nitrogen till only 100K, not below that. Does anyone know what's the entropy of liquid nitrogen or that where can I find it? Thanks!

If I have a bladder (or balloon) that is charged with 300# of a nitrogen gas at a normal atmospheric pressure outside the bladder, and I then enclose the bladder and subject that bladder to a liquid pressure of 25# on it's outside surface area but inside the enclosure. Assuming a constant...

Sorry, I am not a physics major - I apologize in advance if this question is ignorant or if this was asked already. What would be the most effective as a Magnetohydrodynamics weapon? Assuming normal ionized air, would a liquid (liquid silver and salt water) or some type of plasma...

I was interested in liquid cooling system for my computer tower and had a few (?)s 1. How can i make my own liquid cooling system? 2. Is it cheaper than fans? 3. can i make a liquid cooling system cheaply? 4. Does it look cooler than fans? 5. If i can make my own liquid cooling system can i...

examples of substances (elements or compounds) that sink in their liquid states. (solid state is denser than liquid state compared to water) :smile:

Hello, Have you ever drank through a straw? Notice how there is always drink left at the end that you can't drink? I believe the volume of this liquid is the same as the volume of the bore of the straw. Now, my question is; Is there a way of pumping a small amount of liquid (2-5ml) over a...

If you look at liquid crystals in things like moodrings and LCthermometers then you will notice that they can change color when heated. Now I have looked on the internet and found that it has to do with the The cholesteric (or chiral nematic) liquid crystal phase, where they align with each...

hi all How would nitrogen behave at 3000psi? or 6000psi? assuming it starts at liquid form and at 1 atms pressure heated to 20 Celsius. thank you

Heat added to water = (Heat absorbed by liquid) + (Heat transferred to liquid from water (3)) + + (Heat loss from water container to air (2)) + (Heat loss from liquid container to air (1)) + (Heat loss from tube for 280mm) + (Heat loss from dish) i have to find out, to what...

For a coursework, I need to derive the equations behind a viscometer. This viscometer has a free falling object in a non-transparent viscus fluid but it doesn't necessarily need to be the traditional sphere. The restriction only is that the object is connected to a thin stick which is used to...

Hi, All articles on spin liquids I've seen treat them as insulators. This is understandable in the context in which they were first introduced i.e. the resonating valence bond state in which every electron is singlet-ed with every other, and thus essentially blocking conduction. Given...