Liquid Definition and 990 Threads

I just recently had a conversation, where we discussed if liquid is getting colder as it moves along thin tube where it "normally" wouldn't. And if it does, doesn't it mean we have a system that makes things colder without warming anything around it? Which I thought wasn't possible.

If light travels at a certain speed through fiber-optic cable, would the light get to its destination faster if the fiber-optic cable was actually a liquid, and the liquid had a substantial velocity in the same direction as the light?

http://www.msnbc.msn.com/id/29900981/ "One of the first compilations used molten antimony and magnesium as the charge holders with a layer of sodium sulfide between the two."How does this work? What chemical reaction is taking place between the metals and the salt?

In a batch of liquid helium (say < 8* K.) is there a mixture of both ortho and para-helium, or is it only ground state para-helium.? I was under the impression that ortho was a meta-stable state which cannot decay to ground state Para-helium by radiative emission, but by meta-stable we are...

I'm supposed to do a little demonstration to some middle school kids and one thing that's planned is sticking a balloon in liquid N2. The guy who showed us what they want (who doesn't appear to know anything about science) claimed that the liquid you see in the bottom of the balloon when you let...

Hello, I’m new to this forum, and this may seem elementary, but I can’t be sure of my thinking on the subject, so I’ll post the question here. The question concerns the following. I have two household spray bottles, each of the same size. Each has its hose down nearly to the bottom of...

Instead of drag racers injecting nitrous oxide and extra fuel with it . Why don’t they just inject liquid oxygen with more fuel . for more power , Any input will be much appreciated.

Homework Statement How would you use chromatography to determine whether an unknown pure liquid is 1-pentene, cis-2-pentene, or trans-2-pentene? Homework Equations The Attempt at a Solution I looked up the boiling points of the three and see that 1-pentene is lower, but the cis...

How to keep liquid flow rate constant! hi, my grad. project is automated filling machine and am going to use a gravity liquid (water) filler tank ... my question is how to keep the flow rate from the tank nozzle constant while the liquid level in tank is changing as it fills every bottle ?

hello guys how can i have liquid water at 120 c ?

When working with liquid hydrogen or LH2 as a fuel how can you determine how much energy will be released when you break the bond. And an off topic question here can you determine how much force that energy that will produce.

Homework Statement Determine the specific heat of a liquid USING a resistance heater. Exact problem - Design an experiment complete with instrumentation to determine the specific heats of a liquid using a resistance heater. Discuss how experiment will be conducted, what measurements need to...

I'm constructing a pulsed solenoidal accelerator (coilgun) and am looking to boost efficiency by supercooling the copper wire in the coil. I'm also getting a quote for a high-temperature superconductor film to use in place of the copper wire. In either case, I will need submerge the coil in...

Homework Statement Part 1: A liquid of density 1392 kg/m3 flows with speed 1.94m/s into a pipe of diameter 0.28m. The diameter of the pipe decreases to 0.05m at its exit end. The exit end of the pipe is 4.2 m lower than the entrance of the pipe, and the pressure at the exit of the pipe is 1.4...

Are there any substances that are liquid in a vacuum? It seems mercury should be liquid. If so, what forces keep it from solidifying, yet not disipating into a gas?

Homework Statement if the flow rate of a liquid from a 10mm hole in a storage tank holding 5m of a liquid with a density of 490 kg/s, is 0.207 kg/s how far will this stream travel before it hits the ground and will it be contained by a dike 1 m away that is 1 m highHomework Equations Q=pAV =>...

how can i calculate density of a liquid pumped in a closed circuit and i don't know the nature of it ?

Earlier, I had posted that I thought that I had made liquid oxygen. People seemed skeptical that it would work, but I did an experiment to prove the concept. On a ring stand, I had some burning paper towel. I put some liquid nitrogen in a pie tin and allowed atmosphere to condense on the...

1. When liquid oxygen, being paramagnetic, is placed in a magnetic field it possesses magnetization in direct proportion to the field strength. 2. Does this mean that it emits a magnetic field and is itself a magnet while in this field 3. or is it just a part of the larger magnetic...

I have an application where I need to calculate the vacuum (pressure change below atmospheric) generated from a cooling liquid in a semi-rigid container. If the container is filled near full (e.g. 2 litres) with a liquid at e.g. 70C, sealed and left to cool to ambient (e.g. 20C) there is a...

Went to visit a Jr. High today to make liquid nitrogen ice cream. One way is to drop the ice cream mix into the nitrogen. I think we actually made some liquid oxygen accidentally. After doing the dots, we strain the nitrogen through a sieve to catch the ice cream and store the excess in a...

It's hard for me to find the why,bcz most books only give this without any explanation Is there anyone who knows the exact reason?

Hello I have a question please i am not sure about. I work with this machine as a operator but would like to learn more. 1. I have attached a picture of a juice separator tank. The juice enters the separator where the liquid goes to the bottom of the tank and the vapour rises to the top...

Hi this is my first post here. I am attempting to calculate how long it takes for a soda can(355ml) to change from Current room temperature(75F), to say 38F, however the refrigerator or ambient temperature in this case is 35F. I was given a corollary from a friend, but the values I get in...

can you please state some liquid which is a good heat conductor (which have low specific heat capacity)

Homework Statement A helium-neon laser beam has a wavelength in air of 633nm. It takes 1.38 ns for the light to travel through 30cm of an unknown liquid. What is the wavelength of the laser beam in the liquid? (IN NM) Homework Equations v=wavelength*frequency v= d/t The Attempt...

http://www.physorg.com/news184310039.html On the company's website it states; Certificates and expert’s reports by accredited independent institutes and labs have documented the following properties: * Physiological harmless * Food safe * Compatible with skin and mucosa * Free of nano...

Hello all, Consider the following scenario: I have a pipe entirely filled with water flowing through it due to a pump at one end pressurising the fluid. Imagine that underwater, I trap some of the flowing water in a capsule, completely filling the capsule with water, and then closing the...

I have a number of difficult questions regarding this topic! 1. How to find the coeffients of the Liquid Drop model? I have a table of atoms with their masses, and total binding energies. Do I just fit the curve of the B/A vs A to get the coefficients? 2. In a Liquid Drop model, what...

http://arxiv.org/abs/1001.4090"

In which case would water fall out of the tank faster? 1) If I were to take a tank filled with water and bore a large hole in the bottom of it with some area 2) Riddle the bottom of the tank with small holes that have an area that adds up to the area of the first big hole. In one scenario...

I'm troubled by the problem of pumping fuel to a combustion chamber. The big problem is that pressure cannot be directed in some particular direction. So when you see propellant leaving the chamber with a great pressure, it should be kept in mind that the propellant is attempting to leak, with...

I'm starting a Thermal Design course this semester and I need to come up with some type of thermal based design project. I came up with one idea, but I am trying to determine its feasibility, which is not proving to be very easy. I have been trying to find the correlation between pressure...

Homework Statement a ball made of keroseneis put into a liquid kerosene.What happens? Homework Equations ball descends ball floats ball hovers first descends, then ascends. The Attempt at a Solution can anyone help me what kind of kerosene thing is and explain the behaviour of...

Hi All When mixing water and oil, one produces an immiscible system of two liquid phases. Some cosmetic products for women offer three immiscible liquids, producing three liquid phases. What is in nature the maximum number of mutually immiscible liquids (that can be all put together with no...

Hi, I am Design student at Brunel University London and was wondering if anyone could help. One of my current projects is to design a cheap bottle/container to withhold a carbonated drink. The product must be extremely cheap as it is to be aimed at drink markets in such countries as...

Hi all, everyone know that molecules hold more energy in their gasous phase than their liquid phrase, i would like to ask why is that so? If i look at bernoulli's equation and the ideal gas equation, let's say both phases are filled in their own containers which has the same volume and...

Hi, It is common knowledge that the speed of sound is greatest in solids, then liquids and finally gases. But just thinking, if all things remain equal, how will the loudness of sound compare in the 3 states? My GUESS is that sound in gases could be the loudest. Loudness is defined as the...

I understand that liquid water cannot exists on Mars for extended periods of time because: a) The atmosphere is too thin b) Resulting in a lower boiling point water c) Which leads to sublimification of solid ice into gaseous vapour Quite specifically, I would like to understand the...

Homework Statement A box is floating in a liquid. It is pushed down then released to oscillate. How do I determine the period of this oscillation? No idea where to go with this one. Homework Equations The Attempt at a Solution

Did Venus have liquid water in it's early history?

1. An insulated beaker with negligible mass contains liquid water with a mass of 0.250 kg and a temperature of 76.1C. How much ice at a temperature of -12.5C must be dropped into the water so that the final temperature of the system will be 33.0C? Take the specific heat of liquid water to be...

Hi everyone! I wanted to ask if in your opinion is it right to say that band structure calculations (and hartree fock calculations) could live in a framework of the fermi liquid theory where quasiparticles are one-electron states (which could be or not could be the case)...

Homework Statement The U tube contains the liquid.The length of the liquid in U tube is L. If U tube has an acceleration a in X-axis and we make liquid a small oscillation.Find the period of oscillation. The Attempt at a Solution I know the answer is...

I was sick so I actually missed this lesson in class and this wasn't mentioned in the notes I got from a fellow student, nor is it in my textbook. I can't even find a definition for what it means that the heat of condensation is "evolved," so if anyone can fill me in on that I'd greatly...

I am studying vapor liquid eqilibrium for two component systems. There are some things which confuse me right now. These are the questions: - (1) Since there has to be atleast one phase, the degrees of freedom are maximum three. Which means, the degrees of freedom are P, T and composition...

In my lecture, my chemistry professor talked about Bonding in Solids. And he asked us whether diamond can melt(in other words, does diamond can have liquid state). And he did not know either. And I was a bit confused. Because in my textbook, it says that Diamond is covalent network solid and...

Homework Statement On a hot 35 degrees celsius day you perspire 1.0 kg of water during your workout. A) what volume is occupied by the evaporated water? B) By what factor is this larger than the volume occupied by the liquid water? Homework Equations PV=nRT PV=NKbT density of water...

Homework Statement Br2 (l) --> 2Br (g) the options are: a. H is positive and S is positive for the reaction b. H is negative and S is positive for the reaction c. H is positive and S is negative for the reaction d. H is negative and S is positive for the reaction e. G Is positive for...

Hello everyone, I have made number of topics recently I think they have all stem from my poor understanding in this matter. Ok in a gas, molecules can take up a volume and exert a pressure. Inside a fixed container when you increase the temperature pressure increases because more gas molecules...