Liquid Definition and 990 Threads

I am looking for information on the density of a liquid at lower temperatures. I have it at 15C as 725 kg/m^3. The fluid is avgas 100LL. I wish to determine it at lower temperatures. I believe that the change in liquid densitiess is rather small for temperature changes, but I can't verify...

Basically I want to know which bondings are broken when going from the solid phase to the liquid phase. I know that benzoic acid makes dimers (though only in gas phase, some say?) and that they have Van der Waals' forces between their rings. I tried to use my knowledge about water: Water have...

Homework Statement Calculate the force required to pull a copper ball of radius 2.50 cm upward through a fluid at the constant speed 9.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s. Ignore the buoyant force. 1 N Homework Equations...

This is the question I was given: "Describe the bonding within and between the molecules in liquid chlorine." I suppose the obvious problem is, I have no idea what the answer is. Any help will be appreciated! :D

What is a spin liquid as opposed to a spin solid or a spin glass? I know that a spin liquid is generally defined by geometric frustration in the electronic spins of that material (i.e. pryochlore structure)...but how is this different from a spin solid? Can it be that the lattice of the...

Hello, I need some help. I have a fluid inside a rotating cylinder being flung out towards the walls and exerting a pressure upwards. How would I calculate this pressure? Thank you, Kim

In the Venturi effect, in the reduction in pressure and increase velocity on the inside of the convergent cone, does the exit of the liquid on the divergent side mean the pressure that is increased (velocity decreased) can only increase to the maximum pressure that was achieved on the inside...

Rightly or wrongly, there's considerable excitement about a paper which a postdoc theorist at CERN, Bob McElrath, recently posted. One physics blogger headlined his comment "Dark matter is a quantum liquid." The headline may itself be a misinterpretation of what McElrath is saying but I couldn't...

Which of the following is true in a streamlined flow of incompressible viscous liquid? A) When a fluid is in streamlined flow then there is transport of energy from one layer to another. B) The speed of flow at all points in space is necessarily same. C) The velocity of the liquid in contact...

I was wondering also if you put a magnet above it, then lifted the magnet up,would the nitrogen and salt come up too?

Hi, I was wondering, what is a cold burn exactly? We were told that liquid nitrogen (or anything that cold for that matter) can cause cold burns when touched... How can something cold burn you? Or is it not burning you but is it merely named 'cold burn' even though it is simply freezing...

Homework Statement I have a problem from the 2002 AP exam; The questions specifically are from 3b, c, and d. ( See the attached image.)Homework Equations So I'm trying to solve for the unknown density of the liquid (pW). From what I can assume so far, the object is submerged in the liquid...

A tube is sealed at both ends and contains a 0.0212-m-long portion of liquid. The length of the tube is large compared to 0.0212 m. There is no air in the tube, and the vapor in the space above the liquid may be ignored. The tube is whirled around in a horizontal circle at a constant angular...

Homework Statement A sound wave is incident on a pool of fresh water. The sound enters the water perpendicularly and travels a distance of 0.52 m before striking a 0.18 m thick copper block lying on the bottom. The sound passes through the block, reflects from the bottom surface of the block...

The Attempt at a Solution I think the first part is just 9.8 but I have no idea on the rest of the problem (this is due tomorrow need help)

Homework Statement 75 mL of a pure liquid at 245 K is mixed with 100 mL of the same pure liquid 365 K. What is the final temperature? The answer is 314 K but I'm not sure why! Thank you! =) Homework Equations It says this problem has to do with Calorimetry but I'm not sure why...

What are the variables that determine the maximum diameter of a drop of liquid that will not disintegrate while falling through a gas (e.g. raindrop falling in air)?

In fox mcdonald - 6th edition page 83...i read that the free surface profile is independent of any property of liquid. But i have doubt that any liquid tried to acquire a shape so as to minimize its energy. So what went wrong?

1. If you take beer out of the fridge, dip it for 30 seconds in liquid nitrogen, then open it, it will foam up. Skipping the LNO2 cooling stage, it doesn't foam up, why? 2. Pouring a bottle of beer into Dewar of liquid nitrogen, then letting LNO2 evaporate leaves pieces that are shaped like...

hi, I am preety new in this field so I need some help about Comsol sw. I would like to perform a simulation but as I am not a physicist I have no idea how to. So, if anyone can help me, I would be very happy. OK. I would like to simulate the drop of liquid(water) which falls into a liquid...

In physics class we did an experiment where we dropped a metal pin in a beaker of water, covered half the beaker with a mirror and clamped another metal pin above the beaker. We had to find the refractive index of the water by measuring the apparent depth of the submerged pin and dividing it...

The max radius a fallling liquid drop can have without breaking apart is given by the equation: R=√(σ/gρ) where the rho is density of liquid (1000kg/m^3), and the surface tension is .7275J/m^2. g is gravity I am asked to determine the max radius of a drop in units of cm at 20...

Homework Statement A body of uniform cross-sectional area A = 1 cm^2 and of mass density p = 0.8 g/cm^3 floats in a liquid of density p0 = 1 g/cm^3 and at equilibrium displaces a volume V = 0.8 cm^3. Show that the period of small oscillations about the equilibrium position is given by: T...

Hi, I've got a random question. To my knowledge a liquid crystal filter bends incoming light coming in from various angles towards one particular angle as light leaves the filter. Does anybody know the % loss of light caused by this action?

I want to model the flow of liquid through a pipe/tube and calculate the pressure drop over the pipe. What sort of boundary conditions should I be using? I tried with a pressure inlet and a pressure outlet, but I'm not sure if that is the right way to go. Pressure at inlet = 1.8bar, pressure...

Hello, I've been trying to find out how to calculate heat loss from a gas or liquid vs. temp. My understanding is that this is not a simple blackbody problem for a variety of reasons... guess it's more a gray-body problem. Have not been successful at finding papers or texts which deal with...

Hello, I am wondering how one can calculate the upwards force of a less dense object within a denser liquid based on the object's volume (or mass) and density, i.e of an air balloon in water. I've already searched for an answer for a while, but just don't seem to be asking google the right...

http://blog.wired.com/wiredscience/2008/07/lake-of-petrole.html

Hi Does anyone have a figure for this. I've trolled the net for nearly 2 hours now with no success. Any help or guidance much appreciated. Bitman

Homework Statement An open glass tube of uniform bore (uniform inner diameter) is bent into the shape of an "L". One arm is immersed into a liquid of density \rho and the other arm of length l remains in the air in a horizontal orientation. The tube is rotated with constant angular speed...

please tell the name of a liquid (at room temperature) which is attracted by a magnet. and its constituents does not get seperated.

the density of ice(solid) is less than that of water(liquid) and density of mercury(liquid) is more than that of many solids. thinking about it, it seemed natural to me that the more closely are the atoms or molecules packed the greater will be their density. but on packing them closely, isn't...

[SOLVED] Volume of liquid flowing into a tank A tank in the shape of an inverted cone has liquid flowing into it at constant rate. If the rate at which the water rises in the tank is 3x10^-2 m s^-1 when the liquid is at a depth of 2 m, calculate the volume of liquid flowing into the tank at...

Homework Statement A liquid is placed in a U-Shaped tube. Initially both are at the same level. Total length of liquid is L. But later one side is displaced from equilibrium by X.(Difference of both sides is 2x now). Show that the water will oscillate harmonically in the form of a=-w squared...

I am looking formula to calculate pressure drop in a liquid pipe and to determine a suitable diameter of pipe to use for the application.

Here’s an interesting effect discovered by a group of Iranian physicists at Sharif University of Technology in Tehran, Iran (it’s not often we hear from these guys). They placed a thin film of water in a square cell and applied two perpendicular electric fields. One was an external electric...

Hi dear Forumers, I 've run into a little thermodynamic problem: There is a closed vessel, containing a given amount of liquid. I heat up the vessel, higher than the boiling point of the liquid. Here it is what happens: As a start, I know that the pressure inside the vessel consists of...

Does Maxwell Boltzmann hold for liquids? In the case of gases it does quite well for calculating the velocity distribution given a temperature. However, when the molecules are closer together in the case of liquids, how do the van der waals force and others effect the velocity distribution...

i don't know how to describe the relationship between surface tension and the shape of a liquid drop. Also what are the attractive forces that increase surface tension?

Homework Statement A tall cylinder with a cross-sectional area 12.0cm is partially filled with mercury; the surface of the mercury is 6.00cm above the bottom of the cylinder. Water is slowly poured in on top of the mercury, and the two fluids don't mix. What volume of water must be added...

Is it possible for a liquid to exist in a high quality vacuum? For example, a few Torr. If so what are the methods for doing this?

Can oxygen be removed from a liquid using argon gas?

When you boil an egg it turns into a solid. Isn't that kind of wierd?? I thought when you heated a liquid/semi-liquid it will turn into a gas. But on the other hand I get one of my fav. breakfast. HOW?

A search of Quark-gluon_plasma at arxiv.org gave 112 hit for 2008 http://search.arxiv.org:8081/?query=+quark-gluon_plasma&qid=12050205851282cr213.423nN2054076167&byDate=1 Displaying hits 1 to 10 of 6738. Here is a sample --------- http://arxiv.org/abs/0801.0705v1 Realistic Equations of...

Homework Statement What's the polarizability of liquid helium given: density= 145kgm^-3 relative permittivity = X = 1.0566 Homework Equations alpha (polarizability) = (3(permittivity of free space))/N) / ((X-1)/(X+2))The Attempt at a Solution because N is molecules/volume...

how can you explain atomic nuclei. liquid, charged, solid what? and there are some words about nuclear radius rn, rp and rc. what is the meaning of these words. all these data are experimental results or calculated. one is "atomic data and nuclear data tables, vol 71, no. 1, 1999, G.A. Salazar...

[SOLVED] vapor pressure Homework Statement the vapor pressure of a liquid at 25 degrees celcius is 200 torr. If the pressure over the liquid is lowered to 190 torr at 25 degrees celsius the liquid will... a)evaporate b)boil c)freeze Homework Equations The Attempt at a...

[SOLVED] spinning liquid creating a parabolic shape take a container of liquid and spin it... a parcel at any given radius (r) experiences (in the rotating frame) a force outward = mass x angular speed^2 x r and a vertical force of mg. Thus the surface curves such that the tangent to the...

I was simply wondering if dark matter is most-likely a Solid, Liquid, Gas, or Plasma.

What materials can be used for the piping in liquid sodium cooling loops (primary and secondary) and for the heat exchanger?