Liquid Definition and 990 Threads

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...

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.

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 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

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...

Homework Statement Four ice cubes at exactly 0 \ { }^{\circ} \text{C} with a total mass of 53.5 \ \text{g} are combined with 115 \ \text{g} of water at 75 \ { }^{\circ} \text{C} in an insulated container. If no heat is lost to the surroundings, what will be the final temperature of the...

At my work, we go through a lot of liquid CO2 (LCO2), and dealing with the 500 pound LCO2 dewars is a real pain. I'd like to look at options for us making our own LCO2 instead, but have been having trouble finding information about small-scale LCO2 generation on the web. We use the LCO2 for...

The pressure of a liquid of constant density at depth 'h' is given by the equation: P = hρg I am trying to understand the derivation of this equation. I understand it perfectly for liquid columns with rectangular liquid columns but I can't see why it works if the shape of the fluid...

Hi there, I'm measuring the voltage on the output of an amplified photodiode circuit that is capturing light emitted by an Liquid Crystal Display (LCD) projector and there is a periodic voltage drop which I don't know the reason. The projector is projecting an all-white image. I've been...

I'm looking for a general model that I can use to approximate the evaporation rate of a small pool of liquid. The purpose is to calculate the rate at which a few mL of liquid is evaporating at the bottom of a cylindrical test chamber for an experiment. I figured that I wouldn't have any trouble...

When we suck a straw, we produce a vacuum in our mouths hence the atmospheric pressure on the outside is greater than of the liquid above the straw hence pushing the liquid up. But what if we arrest underwater and we open our mouth, why would water flow into it? Is it because our mouth has a...

Im working on an exisiting Ntirogen supply system that's used to blanket boilers and pipelines etc. at a thermal power plant. I am trying to determine the capacity of the system. I have determined the size of the liquid ntrogen tank to be 8m^3 but I'm lost on how to determine the amount of gas...

Hi I am new to physics and this website so forgive me if I am n the wrong section and kind of slow. Would it be possible to make some kind of sticky expanding liquid for trapping things in. I am thinking of a combination of quicksand and glue. This would be something that would be in a pit or...

I've been reading a lot about solar power recently and far greater uses that could be unlocked if we only had a viable way of storing the energy. I've encountered the fact that no battery as yet comes close to rivaling liquid fuels for as energy as well as research pursuing artificial...

A livestream video feed from the event has started and can be accessed via the CS homepage [1] or the corresponding blog on Wired [2]. Some background information about CS can be found on [3] together with a (very) short description on the TM65 [4]. [1] http://www.copenhagensuborbitals.com/ [2]...

I you look at the phase diagram, CO2 is in liquid state at 5,11 atm and t= -56 C. But why does he convert directly to solid state at 1 atm? Again, if you go down from five to one atm, you should be in gaseous state ? Is it have something to do with temperature ? What happens with temperature...

a UK company got $10M to build it, see here http://www.greentechmedia.com/articles/read/liquid-air-for-utility-scale-energy-storage/ . Can this be at least hypothetically feasible or is it more like pure quackery for stupid investors? ETA: to clarify, I don't doubt that it would "work" the same...

I am doing an acid-base titration on liquid soap. I understand that buffers are used in soap. Would that affect the results of my titration? If so, how would I overcome this? Arthur.

How will the level of liqid change if ice melts in it? If its water then there is no change - i know this will happen but i don't understand it( intuitively ) Moving on to other liquids - like oil and mercury - what will happen to their levels? Please help me understand I actually did...

Homework Statement Neon is a monatomic gas; Density = 0.900 kg.m-3 Pressure = 1 atm Temperature = 273K. Density of liquid neon = 1207 kg.m-3 (i) Calculate the volume occupied by one gram mole of neon at a temperature of 273 K and a pressure of 1 atm. (ii) Determine the atomic...