Liquid Definition and 990 Threads

Homework Statement A liquid (density ρ) is poured into a bent tube such that the two halves of the bent form angles α and β with the horizontal. The length of liquid column is l. If one of the liquid levels is depressed and released, the levels begin to vibrate. Find the period of vibration...

how can we know whether the flow of liquid is steady or not from its velocity?

Homework Statement A point source s emits thermal heat energy H every second uniformly in all directions. A cylindrical container with radius R, which contains a liquid of mass m, is placed at a distance h above the source, look at the picture. After t seconds, the temperature of the liquid...

Homework Statement A beaker with a metal bottom is filled with 20g of water at 20∘C. It is brought into good thermal contact with a 4000 cm^3 container holding 0.40mol of a monatomic gas at 10atm pressure. Both containers are well insulated from their surroundings. What is the gas pressure...

Homework Statement A horizontal tube of uniform cross sectional area 'A' is bent in the form of U. If the liquid of density 'ρ' enters and leaves the tube with velocity 'v' then how much external force is required to hold the bend stationary ? Homework Equations The Attempt at a Solution I...

Did I answer this right ? An open tank contains liquid with a specific gravity of 1.735. If the height of the liquid is 10 feet, how much head pressure (in inches w.c. (water column)) will it exert? P= (10) (1.735)= 17.35 What is the pressure in PSI? P= (1.735)(0.433)(10feet)= 7.51255

The figure shows a U tube of uniform cross-sectional area A containing liquid of density p. The total length of the liquid column is L. When the liquid is displaced by an amount x from its equilibrium position, it oscillates with simple harmonic motion. The weight of liquid above AB provides...

Hi, While experimenting with various LED's in LN2, I noticed some strange behaviour from my green LED's. As expected all LED's (except the green one's) emitted light with a shorter wavelenth (for instance, my yellow led turned to red etc). However, my 2 (different manufacturer type LED)...

What color of liquid carbon

I am trying to build a system to transfer liquid nitrogen (LN) into a roughly 6'x4'x2' sealed nitrogen gas-purged enclosure. The LN is in a pitcher-style dewar like this http://static.coleparmer.com/large_images/03773_51.jpg but with an open top, and the container I'd like to transfer it into...

Is there any liquid that has lower density than petrol. one more point : it should not be a fuel.Is there any?

I am trying to understand the best way to dehydrate water from a liquid slurry fruit and vegetable blend, without loosing any of the vitamins and nutrition from the slurry. I expect to very thinly spread out the fruit/vegetables on a sheet, use dried convection air to help with the dehydrating...

Hi, I'm new here! I'm designing a dispensing system with several liquids. The liquids need to be dispensed into a circular area about 3/8" (opening of a bottle). I'm looking for advice, and would like to share my two ideas: A single peristaltic pump where the tube is manually changed. Each...

What happens when a gas molecule collides with a liquid molecule at the microscopic level ?

Atoms in solid are more closedly packed as compared to liquid and gases. But we exert more force, some solid gets compressed but liquid doesn't, why? If atoms are loosely packed in liquid than solids, liquids should get compressed...

A colleague and I want to model how a slab of PCM (wax) solidifies as it cools off. What I have noticed in my experiments is that temperature sensors on the top and bottom of the slab say it should be solid, as they read well below the melting point. But when I peek at the sample, the center...

Homework Statement 0.05625 m^3 of H2O(s) is added to a thermally isolated system of 20 L of H2O (l). If the ice was initially at 0 C and the liquid water was initially at 95 C, what is the final state and temperature? The Attempt at a Solution I missed class for this so I'm going by...

In kinetic theory a liquid is viewed as an incompressible substance in which the atoms are free to move. I would like to know how to find an expression for the molecular flux in a liquid. By molecular flux I mean the collisions per unit area, where collision refers not to the collision between...

Hi. I am doing a physics project and we have been told by my lecturer to find out how to determine the surface tension of a liquid using Poiseulle's Law and to describe an experiment on how to do so. I have no idea how you could do this because none of the variables in the law relate to surface...

Homework Statement A steel cylinder filled with water contains 3000psi of pressure, completely sealed, walls ≈ infinite thick. No gas is present inside of the cylinder, and no heat exchange. To the problem; if a solid rod/piston enters on top of the cylinder with no possibilities to bleeding...

In Chemistry, if a substance is in equilibrium between its vapour and liquid, does it account for the dissolved gas molecules? I have always heard that the rate of evaporate = rate of condensation in a case like this, but does the rate of evaporation include the dissolved gases escaping and...

I had a two liter soda bottle stored outside in the cold. When I retrieved it, the contents was still liquid. Upon opening it, however, when the CO2 bubbles began to escape, the entire contents froze almost instantly around the bubbles. I am curious about what phenomenon I witnessed.

Hi, I'm working on an invention that eliminates liquid slosh in partially filled liquid containers and allows for center of gravity control. I'm wondering if there is a market for such an apparatus where elimination of all slosh is needed. I am aware of baffles, sponges, and diaphragms. A...

A while ago I had asked if anyone ever made liquid nitrogen from scratch without using a prepackaged cooling device (cryocooler). Well, I've done it. I'm working on a web tutorial and better video footage. For those who wish to make suggestions on what you would like to see I am submitting...

Homework Statement See attachment. Only struggling with (ii). Homework Equations The Attempt at a Solution So ultimately after doing everything, calculating B(ε)-B(0) & assuming z>>1 and z2/A > 47 I find that B(ε)-B(0) > 0.048ε2A2/3 I don't really see how this tells me if the nuclei will...

It's a theoretical study. Like the image showing, the curved piston move in container and need energy for that. In the same time, another piston move up and recover energy. The pressure inside container is always the same (need to control speed of pistons, but there is a pressure). No gravity...

How to make a liquid with specific gravity of 4 or 5?!

Homework Statement There are 2 containers.Outside temperatue is -190 degree celcius.(boiling point of liquid oxygen is -180 degree celcius).One is filled with vacuum and can have a minimum height of 6000m and other is filled with liquid oxygen (1140 kg/m3 density) at -190 degree celcius...

Homework Statement When a vessel containing a liquid is accelerated as shown in the attachment its surface slopes as shown, making an angle θ with the horizontal. Does this happen? Homework Equations Consider a differential mass element inside the liquid. It experiences forces F1 and F2...

Hello everyone. I'm am looking for some literature (articles or books) containing information about how is the relation between the liquid water pressure (macroscopic thermodynamic quantity) and it's quantum molecular dynamics (collisions, vibrations, etc.). Like: The pressure increase...

Is there any data about such measurements? I think, there has to be a pressure gradient in a floating liquid sphere due to surface tension.

There is a recent project I have been working on that requires the use of Isobutane as a propellant/solvent, so I have come up with a way to study the chemical compatibility of isobutane: I have a pressure chamber that I built from transparent PVC and opaque PVC with a tire valve as an inlet...

Liquid Distribution Problem -- please help [FONT="Times New Roman"][SIZE="3"][FONT="Times New Roman"][SIZE="3"]Hello guys, I'm a mechanical engineer fresh out the college. I'm designing a liquid transferring device, and really really need some advice/help. So, my device right now has one...

It's interesting to me that a liquid, under the force of gravity, in a container has a flat surface. Tell me if my explanation is correct: if the surface of the liquid were uneven, the higher parts of it would be "sitting on top of" the liquid below. Necessarily, the liquid under these parts...

When a Beaker is accelerating in the x-direction, the water level gets sloped. Why does this happen? Is this situation analogous to the sloping pendulum in an accelerating cart? Similarly why doesn't the water level change in shape when the beaker is accelerated in y-direction? That is, the...

Hi all, Hope you can help I am trying to figure out the temperature rise in a liquid subject to high pressures (7000bar in this case) Is the below adiabatic gas equation still suitable? or is there another way of working this out for liquids? T2 = T1(v1/v2)^y-1 P2 = P1(v1/v2)^y Were y =...

Hello to all, I am new here, with almost the same question like on this thread: https://www.physicsforums.com/showthread.php?t=310911 A question for an artistic project: I am searching for a not too dangerous (glossy white) opaque liquid that hardens very fast on a chosen moment, but...

I am studying Floatation in school and I have some doubts. I get that if an object is denser than the liquid its placed on, it will sink, and if it is less dense then it floats. But what happens when the density of both (the object and the liquid) are same? Will it float or sink? My notes say...

Hi, I would like to calculate the pressure inside a liquid planet in rotation. How can I do ? Pressure depend of depth under gravity but it depend of rotational speed too. Is it gravity pressure less centripetal pressure ? Is it \frac{1}{2}ρω^2r^2 - ρgh ?

Homework Statement A cube of ice, 30 cm on each side, is melted into a measuring cup. What is the volume of the liquid water? Homework Equations I tried doing 30 x 30 x 30 to get 27000 cm^3 but this answer was incorrect. The Attempt at a Solution Not sure what I am doing wron...

Hi friends, I have an issue in solving a Collision of liquid with floor. Please Help me in solving this. Thank you all in advance. The problem is as: https://fbcdn-sphotos-d-a.akamaihd.net/hphotos-ak-ash4/q71/s720x720/1379505_1432382913655481_500299018_n.jpg Attempt...

Hello I want to suspend, or really have the sinking effect be slow, different kinds of rocks/ gem stones in a jar. So i don't really know where to start. I want something easy to get, clear, not toxic. I'm going to start with something like corn sryup and see what it looks like. But if anyone...

The surface of any liquid behave like a stretched membrane. Is it because of surface tension or all the possible forces acting on a liquid molecule at the surface? I asked this question because if the furface behaves stretched because of surface tension then it means that the forces making the...

Does liquid water have ordered structure? I.e., are there significant domains of ordered H2O molecules that maintain crystallinity - translational symmetry - in liquid water at room temperature? I guess this is essentially a hydrogen bonded network - How big are these domains? Or are they...

Homework Statement Homework Equations The Attempt at a Solution The attempt at the solution has been attached, I'm up to part C on this though, so I haven't attempted d or f. I'll get to those as soon as part c is clear as well as A and B. I don't understand how doing a gas phase mass...

A 10g mass is suspended from a string and immersed in a beaker of liquid(Weight of beaker and liquid = 500g). A boy hold the string with his hand not letting the 10g mass touch the bottom of the beaker. (let upthrust generated by mass be X Newton.) Qn: what would be the reading on the...

I want to circulate cold water through copper tubing curled in a spiral about a fan. I'll cool the water with a large block of ice that I can remove and replace like a battery. To avoid making a mess I can freeze the ice inside of a copper housing, and pump the water in copper tubes around that...

Hi, I'm trying to calculate the vibrational energy of a water droplet for a given vibrational amplitude. Rayleigh wrote about this in Proc. R. Soc. Lond., volume 29, 1879, "On the Capillary Phenomena of Jets", Appendix II, but he makes some simplifications (as I understand it) and I also...

Lets say you have planet with 2 Earth radii and 8 Earth masses. The atmosphere is 50 bar and is made up of 85% nitrogen, 10% hydrogen 3% argon, 1% CO2 and 1% other gases. The planets average temperature is 280 K/44 F. Since CO2 is a liquid at this pressure and temperature would it form rivers...

hi all, i need to know what relation should i used for subcooled liquid, for example,a rigid tank is filled with water,as its temp is increased its pressure is increased.if i know the initial conditions and final temperature.how should i find out final pressure. i have seen in thermodynamic...