Liquid Definition and 990 Threads

Homework Statement 1- Use the thermodynamic table to establish an equation giving the molar entropy of liquid water as a function of temperature. Do the same for water vapor. 2- Use these equations to calculate the entropy of vaporization and the enthalpy of vaporization. 3- From the...

Homework Statement The problem is that we need to calculate, how much time it takes for nitrogen to evaporate. Given data: dewar flask is in a room, where is T= 293K temperature; In such flask m=0,2 kg of Hydrogen would evaporate in t= 3600s. Also there is given boiling point temperatures for...

So my book has an equation describing the wavelengths of light that are diffracted by a chiral nematic liquid crystal in terms of the refractive index (n), the pitch of the helix (p), and the angle (θ) with respect to the surface. The equation is this - λ = np√((1-cos2θ)/n2) If this isn't...

I understand that, given Earth's distance from the Sun and it's atmospheric pressure, it is possible for liquid water to flow and to rain down on Earth's surface. I also understand that, given Titan's distance from the Sun and it's atmospheric pressure, it is possible for liquid methane to flow...

On the way into work, I pass through "Hospital Alley". I saw a collection of Praxair tanks with radiating fins that were covered in ice. If you put fins on something that's cold, it will warm up faster. I was trying to figure out why they would have a system that was designed to warm up the...

Homework Statement One mole of a liquid with a constant molar heat capacity of 132 j/mol K is initially at a temp of 80 C. The heat capacity is independent of tempearture. Calculate the maximum work that could have been done onthe surroundings while cooling the liquid reversibly. The...

Homework Statement One mole of a liquid with a constant molar heat capacity of 132 j/mol K is initially at a temp of 80 C. The heat capacity is independent of tempearture. Calculate the maximum work that could have been done onthe surroundings while cooling the liquid reversibly. The...

i am trying to find a liquid that is - cheaply and easily available; easy and safe to use - non-toxic, non-acidic; usable at room temperatures; with a viscosity less than 10 cp; and specific gravity anywhere between 2.8 to 6.5... please help? thanks a bunch warm regards b.

So my question is if I periodically heat some glass of liquid from an arbitrary source, hence providing a driving frequency for the system that will give rise to a phase lag between the temperature of the liquid and the incoming heat from the source, how can I show that there will be a possible...

1. I took two glass plates with a thin film of water trapped in it. One of plates had hook in it. Weights were hung in it. I found that these plates didn't separate until weights of about 2-3 kg was applied. 2.But if slided, it moved easily. I can explain observation no. 2. It is because the...

Homework Statement A liquid is irregularly stirred in a well-insulated container and thereby undergoes a rise in temperature. Regard the liquid as the system. (a) Has heat been transferred? How can you tell? (b) Has work been done? How can you tell? Why is it important that the stirring is...

Homework Statement A hollow spherical shell of external diameter of 1 metre and uniform thickness of 0.2m floats in a liquid with half its volume immersed. If the relative density is 1.5 find t 2 decimal places the relative density of the material of the shell. Homework Equations Buoyancy = Vρg...

Homework Statement Is it possible to use the heat of the sun to heat a liquid (arbitrary liquid) to a temperature that is hotter than the sun, say 5 times hotter? Homework Equations Concepts in thermal equilibrium The Attempt at a Solution My answer is no since you can't get more...

Homework Statement Given- Pressure increases with depth. Homework Equations We know that pressure under a depth h is given by pgh. Where p=density of liquid, g= acceleration due to gravity. The Attempt at a Solution Let us take an example. There is an ocean of a liquid which is...

Hi, what is Liquid Sprays how it is formed Do u have any PDFs or textbooks related to this

Homework Statement A body of uniform cross-sectional area A and mass density \rho floats in a liquid of density \rho_0 (where \rho < \rho_0), and at equilibrium displaces a volume V. Making use of Archimedes principle (that the buoyancy force actign on a partially submerged body is equal to...

Is my understanding correct that the short term stability of fast neutron liquid metal cooled reactors is based primarily on the thermal expansion of the core, while the Doppler coefficient is far less significant factor, as the Doppler coefficient primarily affects the low energy neutrons? (The...

Hey everybody! Let's say we have an infinite metal plate, and we apply voltage between two points, thus creating a potential. On this plate, we take a cutter and create a finite gap (filled with air), somewhere between the electrodes that apply the voltage. Simulations in ANSYS show that...

Hello, I am interested to know how pressure affects how much energy is needed to heat up a liquid, if at all. For example, does it require less energy to heat up water at sealevel compared to the energy needed to do the same at the bottom of the sea? Cheers, klillas

the atomic nucleus mass is given by but why is it a minus away of binding energy / c2 = mass of the empty parts of the nucleus? shouldn't it be a plus? mass of nucleus = proton mass + neutron mass + mass of empty parts of the nucleus?

1. The density of the liquid flowing through the horizontal pipe in the drawing is 1200 kg/m3. The speed of the fluid at point A is 7.5 m/s while at point B it is 11 m/s. What is the difference in pressure, PB – PA, between points B and A? 2. Bernoulli's Equation P1 + 1/2 pv1^2 + pgy1 = P2 + 1/2...

Hi I am having a little trouble designing a micropump out of a mini dc motor-it needs to be able to extract small amounts of liquid (approximately 50 microliters) through a small tube (diameter 0.2 cm or 2 mm) without having the liquid pass through it. Is there any way I can use the motor to...

This started to bother me today. In the first picture, there's a cup wheres a certain amount of water in it. A ball made of aluminium hasnt been dropped in the cup yet. In the second picture, the ball has been dropped in. The ball has not sinked, a string is holding it. Now please tell...

New to the forum. Currently working on a Masters degree in Nuclear Engineering. Has anyone ever heard of the Liquid Fluoride Thorium Reactor (LFTR)? It looks like a pretty neet idea. I have been watching some videos by a guy named Kirk Sorensen who is a big proponent for this technology...

[FONT="Book Antiqua"]While Studying 'surface tension' I came across a statement that 'At critical Temperature the interface between liquid and its vapour disappears' without any explanation or logic. Can Anyone please tell me why such phenomenon is observed at critical temperature ? Thanks in...

Look at a simple single - component system. And PT diagram for this system. Suppose that supstance we looking at has three phases solid, liquid and gas. In that case we have critical point between liquid and gas phase, but not between solid and liquid phase. Why? Why solid - liquid coexistence...

I know that a liquid has more pressure at its bottom part than upper part. Does it mean molecularly than the molecules are more condensed and numerous at the bottom? Also, I watched this clip: This video clip says in 00:50 that "when a liquid is enclosed in a space, and a pressure...

Hello, I'm in the process of building a small liquid rocket engine that uses glow fuel as propellant. Can anyone direct me to a company that sells small liquid rocket engines? Thank you.

I have recently gotten heavily into home beer brewing with some people. To improve on the cooling of the wort (boiled beer before fermentation), I want to pump the boiling liquid through a long copper coil. This coil will be inside a cooler filled with ice and the cooled wort will come out on...

If I have two equal size tanks (150 gallon for example) one with 40% liquid propane the other with a minimal amount of propane gas, when the tanks are connected would the liquid propane equilibrate, yielding 20% in each tank or would just the gas pressure equilibrate between the head space of...

I'm going to steal a picture that was used in a different thread in this forum. [PLAIN]http://img821.imageshack.us/img821/7469/75687957.jpg (both containers are open at the top, and both contain water) I watched an MIT video of professor Walter Lewin, who used these very same...

The boiling temperature of a liquid removes as much heat as is needed to maintain the boiling temperature of that liquid. Nobody can take any liquid to a temperature above that liquid's boiling temperature, right? If they could maybe they would find the boiling temperature of a portion of the...

Hello all, i really need help on a physics project... i am stumped out of ideas.. the task: To build a boat that will propel itself 1 metre forward, then fire a projectile in an attempt to hit a target 2metres away (perpendicular to the direction of travel). The boat must move by either...

I'm a physics newbie, so forgive me if I'm ignorant sometimes, but I've been trying to learn physics on my own and understand things for the past couple of years, and I'm proud to say that I've come a long way - still got a long way to go. There was an article posted last week about perfect...

Hey all! I've return back to my year 12 assignment, the railgun. I got a working model back then, but unfortunately didn't write up a good report. I have the videos on youtube if anyone is interested. The reason for the conductive liquids is because I want to tackle the arcing issue. I...

I was just reading a book on low-temperature physics and stumbled upon a graph that shows the energy of liquid Helium-4 in relation to its molar volume. The graph includes both zero-point energy and the potential energy of the liquid, and the latter goes steeply (basically a vertical line) from...

Liquid cooling PCs, why so expensive?? So I was thinking about getting a new computer which means new water cooling system :D teehee! I was pricing out systems and noticed that some are just so ridiculously expensive. For example, looking at the components vs. stuff I can find on amazon...

I wanted to make tiny movements of the Earth visible by reflecting laser light off liquid gallium metal. It did produce nice reflections on my wall, showing dramatic wobbles of very tiny movements of the liquid gallium. It did however produce light interference patterns which I cannot explain...

Hi. I used google and found this place. I figure its as good as any to ask this question, which I'm sure forces you guys to dumb yourselves down about 3.14 notches. And this very well may not be the place to ask this question, so feel free to tell me to sod off if there's somewhere else I...

Homework Statement The free surface of a liquid at rest contained in a container of reasonably large size is always seen to be horizontal. Can we say that it is a consequence of i) the absence of relative velocity between the liquid and the container ii) the absence of relative...

Only assuming that the worst will happen and that will include the complete breaches through the bottom of the sealed containment of all four reactors, wouldn't it be possible, first, and then prudent, second, to be ready to cool these molten masses with liquid nitrogen being injected...

something that is going on that seems odd to me is the pumping of the radioactive liquid waste direct to ocean. I am sure there must be a significant amount of long lived/insoluble/particle type rad waste in there? Is there not a good chance these hot particles could get caught up in ocean...

I have 2 locations of approx 80”w x 80”l x 112”h to install a tank(s). The tank must meet the following criteria: 1. Influent: 100gpm continuous flow of ground water dosed with 12% sodium hypochlorite to eliminate ammonia 2. 10 minute minimum verifiable retention time in the tank during...

I need to test a system for liquid sodium wicking under high temperatures. The setup is as follows: Solid sodium pellets are placed in a tube which is then purged of oxygen (replaced with Argon). The tube is sealed and then heated to 300-400 degrees Celsius and agitated with a shaking...

I need to test a system for liquid sodium wicking under high temperatures. The setup is as follows: Solid sodium pellets are placed in a tube which is then purged of oxygen (replaced with Argon). The tube is sealed and then heated to 300-400 degrees Celsius and agitated with a shaking...

in internal combustion engines, how do they run hydrogen in these engines like the BMW hydrogen car when hydrogen combusts into H2O?

So I am trying to find a liquid at room temp., preferably with a low viscosity, non-toxic and non-acidic, that has a specific gravity greater than 1.5 and is fairly cheap. Tall order? I have done a little research and my best bets seem to be Copper Sulfate Pentahydrate, Zinc Chloride, or...

Homework Statement consider the figures 1 and 2 which show two identical, rectangular wooden blocks Weight of the block: Homework Equations Pressure = F/a Pressure = Density x gravity x height The Attempt at a Solution The weight of the block, i have tried to find...

In thermodynamics Change in Internal Energy = Heat - Work (\DeltaU=Q-W) During vaporization my Heat is mass*Latent Heat (Q=mL) and Work is Pressure*change in volume (W=P\DeltaV), so \DeltaU=mL-P\DeltaV. Let's take any of the natural monoatomic gases, Neon in this case. \Delta = Volume...

I'm attempting to find the velocity of a sphere falling through a liquid with an upward countercurrent flow. I already have the velocity as a function of time in a stagnant flow regime, but do not have one with countercurrent flow. Here is the equation without countercurrent flow: v(t) =...