Liquid Definition and 990 Threads

Why does the gravitational potential energy of a non-viscous liquid increase when a body falls through it?

if in a tank full of water big a wooden box floats on water then will the pressure below the box in the liquid be different from , the case , when there would be no wooden box ??

Hi, Im working on a model where I need to look into the rate of heat transfer from a gas that's being compressed by a "liquid piston" of water. So basically a closed container containing a fixed amount of air n of volume V, is filled with water from the bottom until the volume of the air...

This is not a homework question. I am trying to figure it out myself. Let a spherical shell of radius R be filled with a liquid (full). Now let a small hole of area A be made at the bottom of the shell. Find the time required to empty the shell completely.

We've all heard of the three states of matter: solids, liquids, and gases. Recently someone told me that there is some sort of state of matter between a liquid and a gas. Does anyone know what he's talking about?

Hello! I need some help regarding a simple matter... How do I derive an equation for the increase in volume when a liquid goes to a solid state when I know the density of the liquid?

Homework Statement On the afternoon of January 15, 1919, an unusually warm day in Boston, a 28.1 m high, 27.4 m diameter cylindrical metal tank used for storing molasses ruptured. Molasses flooded the streets in a 9 meter deep stream, killing pedestrians and horses and knocking down...

Homework Statement A 10-kg block of ice has a temperature of -12°C. The pressure is one atmosphere. The block absorbs 4.15 106J of heat. What is the final temperature of the liquid water? Homework Equations Q=mcT The Attempt at a Solution i know i have to find the change from...

I can sort of understand why water is denser than ice, but for CO2 I cannot understand why it is the other way around. Here is my best shot at understanding it: I imagine H2O's solid structure as a hexagon due to the hydrogen bonds, where each point represents one atom. When these bonds are...

1. A piece of copper whose density is 8.93 gm/cm^3 weighs 180 gm in air and 162 gm when submerged in a certain liquid. What is the density of the liquid? 2. d = m/v 3. I wasn't sure how to compute this but I calculated the volume of the copper based on its density and air weight...

This may be hard to explain, but here goes... Say you have one of those little plastic BBs. When there's just one, it behaves like a solid sphere (which it is). But if you have a large number of them, the mass sort of acts like a liquid - it pours and flows and similar things. My questions...

Homework Statement Assume a liquid is flowing through a pipe of cross-sectional area A at pressure P and velocity v. If, at some point, the area decreases, then; -velocity increase, pressure remains same -velocity increases, pressure decreases -velocity increases, pressure increases correct...

Ok so when they compress the gas and remove the heat until it liquefies then how do they further cool the liquid. I know they can evaporate a little more of the liquid helium to cool it a little bit more. And i couldn't find much on how a pomeranchuk cell works . Any input will be...

Hi guys, I'm a physicist and would appreciate some direction in helping me understand the dynamics (or chemistry) of graphite in a bath of liquid metal. Eventually the bath is cooled into a solid ingot. There are several different metals which are used (Cu, Fe, Al as well as many alloys). Any...

This is a very cool liquid simulation: http://grantkot.com/MPM/Liquid.html.

Hi guys/gals, I have a problem, my maths isn't that great. I have some underground storage tanks with petrol in them. and I can only measure depth of the liquid at the bottom. however i want to know the volume for disposal purposes. Can anyone tell me how to find the volume given the height...

Dear all can anyone explain to me the semi-empirical mass formula and liqiud drop model, I really don't understand what is the difference between them and which one came before the other. I really confused

Hi everyone I'm reading up on the possibility of liquid water existing on the surface of Mars, and have confused myself! During my reading, I have come across various definitions that say liquid water can exist if the temperature is above 273 K and the atmospheric pressure is above 611 Pa...

Homework Statement Bacteria use swimming to seek out food. Imagine that the bacterium is in a region of low food concentration. For the bacterium to profit from swimming to a region with more food, it has to reach there before diffusion of food molecules makes the concentrations in the two...

Why the specific volume of a liquid decreases with the increase in pressure at saturation temperature and why the specific volumes of vapor at saturation temperature decreases with increasing pressure??

A hemisphere shaped tank with vertical outlet pipe is full of mysterious liquid. Find the work required to pump the mysterious liquid out of the outlet. The density of the mysterious liquid is 300/98 kg/m^3. [Radius is 2m and vertical pipe is 1m] W= F*d =m*a*d =D*v*a*d D=300/98 kg/m^3...

I have a question regarding the terminal velocity of an object falling through a liquid. Now the speed will increase up to the terminal veloity in a given time. What I do not understand is in this calculation I'm performing (solving the equation of motion for the speed, when acceleration equals...

how does liquid exert pressure in all directions? When a liquid is placed in a container, i understand that it exerts pressure on the bottom of the container due to its weight but why does it exert pressure on the sides of the container? is that due to the fact that the molecules in liquid are...

In an attempt to create Rochelle salt crystals using cream of Tartar(or what I thought was cream of tartar) and sodium carbonate, I created some strange orange liquid which smelt mildly of ammonia. I decided to leave it in a dish anyway and see if any crystals came out of it. Crystals emerged...

The forces of a liquid pressing against a surface add up to a net force that is perpendicular to the surface. I cannot visualize this. Could someone help me out diagrammatically here?

Homework Statement I have been searching online for help with this equation but have found nothing at this stage. I am looking for an equation to satisfy the Volume of a Frustum of a cone. The liquid level is measured via a sensor located in the centre point, top circle(area) of the...

I want to know how to increase the surface area of a liquid without doing any work. Heating would be counted in work done.

Homework Statement This question is a product of my own mind- Refer Figure. Suppose the value of P= 2Patm, can 2Patm fall to Patm before the liquid levels with the hole-level? In other words, can there be a liquid column above the hole?

Homework Statement The apparatus shown consists of four glass columns connected by horizontal sections. The height of 2 central columns B and C are 49 cm each. The height of the liquid in A and D is 52.8cm and 51 cm resp (measured from the baseline). The water columns are maintained at...

A closed bottle contains a liquid. The bottle is shaken vigorously for 5 minutes. It is found that the temperature of the liquid is increased. Is heat transferred to the liquid? Is work done on the liquid. Neglect expansion on heating. I think the temperature increases due to the internal...

Can anyone recommend a white light source to be used in a cryostat down to 77 K? We are using it in temperature-dependent studies of PV devices. Currently we have an incandescent bulb which has shifted its spectrum towards red over time and we're looking for a replacement. It would be nice to...

Homework Statement The limbs of a manometer consist of uniform capillary tubes of radii 1.4 x 10^-3 m and 7.2 x 10^-4 m. Find out the correct pressure difference if the level of the liquid (density 10^3 kg/m^3 and surface tension 72 x 10^-3 N/m) in narrower tube stands 0.2 m above that in the...

This might sound trivial, but I've always been curious as to why exactly when you put your finger on the top of a straw in a drink and lift it up, the liquid stays in it. We're studying pressure and fluids right now in my physics class, and I have a general idea that it has to do with the...

I want to design a model for falling spheres in a Newtonian fluid and I just want to make sure I've got everything right. Are these all of the forces that apply on an object in a liquid? I have the following formulas...

Hi, Can anyone suggest a conducting liquid that does not get electrolysed when current passes through it ? By liquid i mean anything, a salt solution, a liquid metal...The only restricting factor is that is should be in liquid state at room temperature(i.e does not require extra...

[/tex]Homework Statement The differential of the internal energy of a surface of a liquid with surface tension \gamma and area A may be written as dU=TdS+\gamma dA Write down the corresponding form of the Helmholtz free energy F= U -TS. Using the fact that these equations involve exact...

(apologies for the formatting, mixing LaTeX and regular text looks ugly, but I don't know how to do it otherwise) Homework Statement This is problem 3-7 from Thornton and Marion's Classical Dynamics. A body of uniform cross-sectional area A = 1 cm2 and of mass density \rho=0.8 g/cm3 floats...

I would have thought no, but my textbook appears to imply that the liquid being boiled in a confined space doesn't at its normal boiling temperature but does boil at a higher temperature. The reason I don't think a confined liquid can boil is because the external pressure in a confined liquid...

Hi all, I came across your forum looking for some help to settle a debate. A few fellow home brewers and I are debating what factors influence the rate of loss during a boil. The original question came from a brewer who switched to a wider pot and discovered that he lost more liquid over the...

Homework Statement My book says that 'A liquid gets heated up when it evaporates' Homework Equations The Attempt at a Solution I heard the opposite- the liquid cools itself. Please help

Water is emptied from a spherical tank of radius 24 ft. The water in the tank is 8 ft deep and its level is decreasing at the rate of 2 ft/ min. At this time, what is the rate of change of the radius at the top of the water?

Is the enthalpy (H) of liquid water greater than that of the same quantity of ice at the same temperature?

Hi I would like to consider the thermodynamics of boiling a liquid to a gas. I am assuming there are no intermolecular forces in a gas. I am also presuming intermolecular forces in a liquid are exothermic, though people hardly ever talk about the energy of IMF Lets assume the the...

what imean by natural is...u know how motts comes in regular and natural? well i bought the natural kind..but i bought store brand. if i wave my hand behind the bottle i can barely see it...(the shadow of it) with gatorade i can see it much clearer..but idont like gatorades... one site...

Hi I'm trying to review some fundamental chemistry and I want to make sure I understand the difference between a liquid and a gas. I will build this question up in stages. I'd like to consider propanone. I believe the intermolecular forces (IMF)in liquid propanone are dipole-dipole and...

Hi I have a question about the capillary force between two hydrophilic surfaces. I am working with small cantilevers (5-50 um long, 5 um wide, 200 nm thick). If L represents the lever, which is hydrophilic, and X represents some bulk material (also hydrophilic), a profile of the lever looks...

Consider a vertical pipe partially filled with liquid. The pipe is open at the lower end and closed at the top. See the attached picture. Will the liquid fall out or not? In a small diameter pipe a stable meniscus will form due to surface tension and prevent the water from falling out. In a...

If I Press gas to a pressure in which it changes to liquid. What would be temperature of this liquid after?

Hello. This is probably a really dumb question, but I was wondering how the ph system works in relation to making a ph 7 liquid (which would be water and salt, right?) The way I was thinking was if you have an acid with a ph3 and a base with a ph8, and you wanted to mix them to produce a ph7...

Homework Statement an aluminum object with volume 100 cm^3 and density 2700 kg/m^3 is suspended in ethyl alcohol (density 790) by a string. what's the tension in the string? Homework Equations Fy = Fb + T - mg T = mg - Fb Fb = p_f * v_f * g = p_o * v_o * g The Attempt at a...