Liquid Definition and 1000 Threads

I know that When there is increase in temperature the molecules in a viscious liquid move further apart and this decreases the viscosity of the fluid. So does that mean the molecules are far apart in case of liquid and these molecules move further apart with increase in temperature. So a...

Hello all, quick question: When Plasma cools what state does it return to? Is it a liquid or the state it was in before at room temperature? Do the atoms rearrange into what it was like before i.e. the same element or something completely different? Thank you

(I'm new to the Forum, so if I violate the rules unknowingly, please do let me know) So, during a recent research, I analyzed the frequency spectrum of our hand's oscillation while walking. As it turns out, it contains distinct harmonic frequencies (around 1.8*n Hz), and the second among them...

Homework Statement Homework EquationsThe Attempt at a Solution Applying Archimedes priniciple the force exerted by liquid on the upper hemisphere would be ## F = \frac{2}{3}\pi R^3 \rho g## . Now I am not sure , what does it mean by force due to gauge pressure ? Any help is appreciated ...

Homework Statement Homework Equations P=ρgh The Attempt at a Solution I already have the solution. My question is simple. I can't understand how I define the direction of pressure in each "changing" point. I also have the solution if needed.

Hopefully this question makes sense; when talking about solubility of a gas does this have any relation to its ability to mix with another gas? i.e. gas solubility in gas, versus, gas solubility in liquid In ultrasonic cavitation some say that a more soluble gas can more easily enter the...

That's the title of the NASA press release (I added the date). 8 a.m. PDT = 3 p.m. UCT = 5 p.m. CEST (Central European Summer Time) The panel includes an expert for the HiRISE experiment, a high-resolution telescope in Mars orbit. Whatever they have, apparently images of some area are highly...

There is a liquid phase homogeneous reaction going on in an CSTR, which operates at 4 atm. Is it necessary to have pressure relief valve? If so, what will be vent out when the pressure exceeds, since it contains liquid only?

Hi... any idea on how to calculate force needed to pull up something stuck on the ground? ex: Boot stuck on mud person sinking on quicksand or car sinking in water

Hello, I have an assignment that centers around the Rankine cycle and requires me to find the enthalpy of water entering the boiler. My professor has told me to take the enthalpy value at boiler conditions for a saturated liquid. I'm not really sure why I should make this assumption as I was...

I'm working on a problem and need to find quality, mass, and pressure. I'm given a temperature (2°C), a volume (1200m^3), and a percent volume occupation (1% saturated liquid). Is it "legal" to use the saturated liquid tables, at 2°C, to find the volume or pressure (I forget which one we were...

This is a diagram of a pitot-static tube. My question is however not related to its applications but rather, what causes the liquid to rise up the static tube? The static tube is at right angles to the fluid flow. I understand that this is a very basic question but I can't seem to get my head...

http://phys.org/news/2015-08-high-pressure-secrets-osmium.html what do these new findings mean for liquid metallic hydrogen? Why don't they use this equipment on hydrogen?

At a temperature of 0 C the density of ice and liquid water is 0.9187 g/cm3 and 0.9998g/cm3 respectively. Consider a situation where the density of ice is increased to more than 8.83% at 0 C, what would be the consequences of this to the life forms? The life forms would vanish because of the...

Hello I need to build a pump to transfer alumina filled polyester resin. Can I use something like this - http://www.ebay.co.uk/itm/1Pcs-KSC50x100-50mm-Bore-100mm-Stroke-Double-Action-Pneumatic-Air-Cylinder-/350908339995?hash=item51b3c4571b ? One to use resin pumping, other for moving the resin...

Hi, I thought I would post this, hope not against protocol, thought may be helpful to someone else at some point -- though hope it is not necessary:. I had dropped a bit of liquid on the PC (laptop) , in the keyboard area. PC was not working well, typing errors, etc. I put the laptop open...

Liquid junction potential occurs when 2 solutions of different concentrations are in contact with each other. The more concentrated one would have tendency to diffuse faster comparitively than less concentrated. The rate of diffision depends on the mobility of ions. Weston cadmium cell is...

Obviously we don't have the technology to make this work now but I would like to know how plausible this is as a concept/thought experiment. Basically the idea is to discover a gas or liquid with a very high activation energy (for some reaction) so that it can absorb an explosion or control a...

Hello! I have some troubles finding a way to estimate how much temperature of liquid would rise when it is suddenly adiabatically pressurized to thousands of bars. In normal conditions liduids such as water are considered to be incompressible, but certainly not in 5000 bars. Because water (or...

HI Guys .. I really need some help on this ... I need to manufacture(mix) a liquid that 'displays' as UV light if that's the correct term. any ideas where I could start ? I have limited chemicals knowledge :/

Hi all, I'm brushing up on some thermodynamics, and having been reading up on the interpretation of temperature as derived from kinetic theory. I can follow the derivation for an ideal, monatomic gas which relates temperature to the average, translational kinetic energy of the molecules. Most...

Hello, I have been working on a personal project involving the transfer of liquid CO2. I want to figure out a way to measure the transfer of liquid CO2 from one cylinder (supply cylinder) to another (receiving cylinder) and get an exact measurement of how much CO2 was transferred into the...

Hello, Can anyone answer me how to caluculate the massflow of the liquid. I know the inlet mass flow , volume of the pipe , and the inlet pressure and outlet pressure of the pipe. Do we have any equation to caluculate the outletmass flow with respect to differential pressure? Can anyone help...

Homework Statement A barrel, open on the top, full of water, has a radium ##R=0.25\text{ m}## and a height ##h=0.75\text{ m}##. At its base there is a hole where a pipe is attached. The pipe's length is ##\ell=1.0\text{ m}## and its radius ##r=0.0019\text{ m}##. I would like to find the time...

I have a refractory adhesive based upon liquid Na2O3Si and other unknown constituents. It remains a liquid until a specific temperature... when it boils, or gasses. At this point, if the temperature is removed (or increased), the liquid becomes a solid. It would appear (perhaps incorrectly)...

hello I have a liquid or gas inside a metallic box (eg. stainless steel 5mm thick) how can I increase its temperature without heat convection or conduction?

Is it simply the gaseous state of a liquid substance? For instance, water vapor, in this context, would be the gas state of water after having transitioned from a liquid state.

What are we referring to when we denote, say, NaCl (aq)? Are we referring to the dissolved NaCl (Na+ and Cl-)? Are we speaking of the solution as a whole (the dissolved NaCl and water)? Also, how does the liquid state differ from an aqueous?

I've read a fews post about liquid hydrogen boil off, but could use a bit more clarification; insight on the following thought experiment would be really helpful: What happens if I take a 1 L steel vessel, put 1 L of liquid H2 into it, seal it off, and let it sit in a room at 25C? The density...

No idea why this popped into my head on the drive home tonight, but here we go: Would it be possible to build a rocket filled with either liquid Nitrogen, or some other super-cooled substance, then use a battery of high-energy, ground-based laser beams pointed at the super-cooled propellant to...

Homework Statement Homework Equations height of liquid above water level ##h=\frac{2T}{R\rho g}## for isothermal process :##PV##=constant And if ##P_0## is atm. pressure, and P is pressure just below the water level in capillary tube, then $$P=P_0-\frac{2T}{R}$$ The Attempt at a Solution...

1) Alright, so the problem reads, "The liquid in a horizontal pipe of diameter d1 before a constriction is at pressure P1 and flowing with the speed v1, and then in the constriction with diameter d2 the gauge measures pressure P2. What is the density of the liquid?" 2) I'm assuming the...

Homework Statement A simple model for liquid crystals confined to 2 dimensions is o assume each molecule can only align in one of 2 perpendicular directions. To construct a landau model its convenient to define order parameter, s : s = 2 ( Np - 0.5Nt ) / Nt Np - number molecules...

Hi Everyone liquid nitrogen is very useful . i want to know how to make liquid nitrogen? i won't make a one. but i only want to know how to make it .

Please could someone verify this statement as I understand things: If an object has a low reynolds number (or the fluid is very viscous) then it is dominated by viscous forces and inertia plays no role. The object is in a laminar flow regime. That last part, is it correct? What I'm asking is...

We Know that in conductive Solids there are lots of free electrons available & they drift when electric field is applied. Their drift velocity is in the range of mm/sec to cm/sec. Now if we consider any conductive liquid which is flowing & we connect the electrodes in such fashion that the flow...

Why is the average kinetic energy of the molecules a cold liquid less? As the temperature of a liquid decreases, the average kinetic energy of its molecules reduce. What is the reason behind this?

Hello Fellow members. In many litterature about mixing liquids in tanks, they describe how to calculate the natural frequency of shafts in free air. But i have only found one book that describe about natural frequency of shafts in liquid, and it should have a damping effect of the natural...

Homework Statement This is how my teacher dictated the question... ---A layer of oil 3 cm thick is floating on a layer of coloured water 5 cm thick, the RI of the coloured water with respect to the oil is ##\frac{5}{3}##. The apparent depth of the liquid is ##\frac{36}{7} cm##. What is the RI...

Hey Is there any liquid available that is magnetic at room temprature? I know that liquid helium is magnetic but at very low tempratures not at room temperature. Thanks

I have a small 'cryostat' which I would like to fill with liquid helium to conduct an experiment. It consists of a circular plastic kitchen measuring cup 3 inches wide at the top, 2 and 1/4 inches wide at the bottom, which is flat, and 1 and 1/2 inches deep. The plastic wall/floor is about...

Homework Statement Dear Mentors and PF helpers, I can do part (a) and (b) but don't really know how to do (c) and (d). Can somebody teach me how to go about solving it. Homework Equations Volume of cone: $$\frac{1}{3}πr^2h$$ Volume of cylinder: $$πr^2h$$ Volume of sphere...

What's a good way to maintain liquid level inside a vessel of liquid that's heated via a jacket & has a feed pipe. Feed pipe is approx. 1/2 inch dia & expected flow in is about 300 Litres / hr Would a ball cock work with all that boiling & bubbling happening around it? I prefer a purely...

Homework Statement We are in a planet where the gravitational acceleration is 1 ms-2. Tankers fly over the surface of a liquid ammonia lake (at 239K) at a height of 40m. A special, insulated, frictionless tube is lowered into the ammonia 1m below the surface. We want to draw up ammonia through...

Hi friends, I have the following problem, I know there is a system named bubbler level gauge, it works by measuring the required pressure to displace the liquid inside a tank. My known data is: the height of the tank The Diamater The Density of the liquid The Volume of the tank Let's say I...

Question: The height of the given vessel is h,and the width of the given vessel is b (as given in the diagram). The density of the liquid is r.Find the force exerted by the liquid on the slant wall. Relevant formulae : P = F/A F = Vdg An attempt at the solution...

Hey! :o A liquid flows through a flat surface with uniform vector velocity $\overrightarrow{v}$. Let $\overrightarrow{n}$ an unit vector perpendicular to the plane. Show that $\overrightarrow{v} \cdot \overrightarrow{n}$ is the volume of the liquid that passes through the unit surface of...

Homework Statement A falling sphere viscometer measures the viscosity of a liquid from the terminal velocity of a tiny, falling sphere. One such device determines that a tiny sphere of radius 46 μm falls through a liquid with a terminal velocity of 2.5 mm/s. If the density of the sphere is 4171...

A horizontally oriented tube is rotating with angular velocity ω about one end of the tube which is open. The tube has ideal liquid filled inside it as shown in the attachment. Why does there have to be a pressure difference between two points in the ideal liquid at the same horizontal level...

Homework Statement The problem I have is not actually so much a physics problem but more of a logical problem. When we look at rulers and any kind of measuring tools, we start from zero. We count the number of intervals instead of the divisions. Suppose we have a video with 7 frames per...