Water Definition and 1000 Threads

I need to test this gauge. It reads -0.25 to 0 to +0.25 inches of water. I am using it in the 0.02 to 0.03 negative and positive ranges. What of known value can I use to deflect this gauge maybe .1 or .05 in either or both directions to test the gauges accuracy? it gives the option of selecting...

Hey Folks! Just need a quick sanity check ... Putting in a new 4in well and submersible pump ... trying to wrap my brain around the "physics" of it ... Here is what I ***Think I Know*** : 1) The Energy required to move any given volume of water to ground level can be calculated using M*G*H ...

I am about to have a water softener installed and I thought I should learn a bit about the Chemistry involved. There is loads of advertising blurb on the Web but very little precise Chemistry. I am sure someone here can help me with this. The basic softening process is fair enough with sodium...

You know when you push a basket ball in the water and let it go. It goes back to the surface very fast and is expulsed from the water and goes above the water surface. Now take it to an extreme, you place a capsule of air at the bottom of the ocean and set it free, how high can it reach above...

Homework Statement A closed container is connected with a tube, water will enter the container via this tube. How would the amount of water in the container affect the pressure in it when water enters the container via the tube? Is this the same as changing the volume of the container (which...

I was Nikwaxing my boots the other day. This is a water based wax emulsion and uses no solvent. How does it work - or rather why wasn't the water based approach always used? There are EU directives about paints that forbid the use of solvent based paints so even car bodies are (will be?) coated...

Hi, I didn't know whether or not to put this topic into general physics, classical physics etc. (correct me if I'm wrong on posting here) Basically I have a normal water bottle, 0.5 L (maybe a little more, up to 0.6 L but definitely not more) and I always heat the water bottle up on a radiator...

For a vertical pipe of water can the pipe length affect the velocity of the water? note: the water is flowing through this vertical pipe.

I wasn't quite sure what to call this thread or where to put it. I left a one gallon jug of water sitting in the kitchen floor. When I came back maybe 4 or 5 hours later there was a pool of water around the jug. I looked at the jug and found water slowly streaming out of the top. The jug was...

I found, at least in my uneducated opinion, a very good demonstration of water as a dielectric. I understand that putting water in a bag will change the dielectric constant of the water in it somewhat, but I think the capacitance meter at least makes water's value as a dielectric visually...

When a car is parked and not running... is the radiator water (or coolant) pump totally shut that water from the radiator side can't enter the engine or in equilibrium (what's the exact term)? The water pump is a centrifugal pump.. does this totally shut the inlet and outlet from mixing so that...

Why is entropy lost by hot water less than the entropy gained by the cold water?From perspective of energy,why is it better to take water and heat it to a temperature than it is to mix hot water and cold water to get a particular temperature.

Hello everyone :) I have a question.Is it possible for life to exist in other planets without oxygen and water? I mean just because we need it to survive here on Earth.It doesn’t mean all planets need it to support life as well.

Homework Statement "The 2200 m/s flux in an ordinary water reactor is 1.5*10^13 neutrons/cm^2*s. At what rate are the thermal neutrons absorbed by the water?" Homework Equations (unsure) The Attempt at a Solution I know that absorption of a thermal neutron (a neutron in thermal equilibrium)...

Homework Statement A tank originally contains 100 gal of fresh water. Then water containing 1/2 lb of salt per gallon is poured into the tank at a rate of 2 gal/min, and the mixture is allowed to leave at the same rate. After 10 min the process is stopped, and fresh water is poured into the...

Hi, I am wondering how I may calculate the rate of water flow into a container(say, a empty box) with a hole in it, and with the whole box immersed in water. Does it have something to do with the force of water pushing against the container, and calculating how fast water can flow through the...

Homework Statement Homework EquationsThe Attempt at a Solution I think the water waves will undergo refraction from the interface and since it is denser , it should bend towards the normal . By that logic 4) should be correct , but this is incorrect . I might be applying wrong concept in...

Not sure where this might best be located. This is not a question, more like a show and tell. I read about superionic water in a NY Times article here. Never heard of it before. Formed at high pressure and temperature, it is described as simultaneously solid and liquid, and as "rigid lattice...

we planning to heat water directly using microwave for industrial purpose. we need only 33deg Celsius for that I need this.

Homework Statement Theses questions have been modified to solve my own inquiries. The originals can be found in the attached file. A parallel plate capacitor has area A = 1 cm2, a plate separation of d = 0.01m, and is filled with air.(a) If the breakdown field is E0 = 3 × 106V/m, calculate...

Homework Statement The apparatus shown may be used to determine the density of an unknown liquid X. The tube has a uniform cross section and the height of the water column is twice that of Liquid X. A and B are the same horizontal level. The pressure difference between points A and C is...

Homework Statement Hello everybody, How can I calculate pH value of 4.41 M HCl water solution? Is it possible for such a solution to exist? Thank you very much for your help, CroSinus Homework EquationsThe Attempt at a Solution When I try to find - log 4.41 I get a negative value. I do not...

Homework Statement (For this problem ignore the height of the firefighter) A firefighter, a distance (d) from a building, shoots a stream of water at an initial angle, above the horizontal, at initial speed (Vo). At what height (h) does the water strike the building? No values were given to...

Say I have a disk spinning in a buoy. Let me say the spin axis is vertical to the flat surface of the buoy (or sea if there were no waves). Now along comes a wave (that will induce a "precession" of the disk/buoy. The axis of this precession is from "starboard to port." This would induce...

I'm currently trying to find how much water can be condensed from an airmass of a certain dewpoint if it is sent to a lower temperature. The water will be condensed over a period of time. I have the dewpoint of the initial air and the temperature of the environment where the moist air is being...

Is separating hydrogen and oxygen molecules possible? If so, how?

Hi, it is well established that octanol is the preferred solvent for partition coefficient studies in environmental chemistry, however, some studies ui.e Noble A. Parition coefficients (n-octanol-water) for pesticides) J Chromat. 642 3-14, mention that estimating toxicity based on solubility in...

If water vapor is pulled inwards and cooled at a fast enough rate could if be frozen back into a solid form? i understand that they would have to be froze together as soon as contact is made but if this is possible what would the temperature have to be? And could this be the only thing that can...

Hi all, I am new on this forum, hope you are doing good. I have a question related to a project I am currently working on. The system is a 40+ floors mix used building, with a cooling system composed of a couple of centrifugal chillers, and a primary/secondary pumping configuration. There is...

Homework Statement 1. A fountain shoots water out of the ground at a 40° angle. It’s horizontal velocity is 2 m/s and the water lands 3 meters away. What is the maximum height that the water reaches during that time? Homework Equations Dy =vit + ½ at2 and Vfy2 = Viy2 + 2ady The Attempt...

Does adding oxygen influence any physical properties of water which is oxygen deficient? Is it possible that adding oxygen leads to some temperature change and expansion?

Is water at the bottom of the ocean oxygen deficient? Compared to water at the higher levels.

So as we know at the bottom of the ocean we have water cooled to 0-4 degrees celsius which is very dense and also compressed due to the pressure. Imagine we lower a few kilometres long pipe to the bottom of the ocean (it's made of material that is strong enough to sustain pressure). It's closed...

Hey guys, I have been scouring the internet to find an answer but I can not. The problem is: I want to heat water to boiling point with the least amount of energy required. I found out that if you apply vacuum into an chamber with water (room temp), the boiling point can be as low as room...

Hello, why does the egg float upwards in a stirred bottle of water? I have tried making same experiment with other objects in different shapes but only the egg shape seems to float upwards. Here's the link to the video: Second experiment: Thank you for help.

Hi all this is my first post , I have been using this forum for a while , but mostly directed here by Google and have found the answers to my questions.. until now . I am trying to design a cooling system that will use chilled water around 1deg C to cool vegetables that have been cooked. So...

So, from my last thread “Why doesn’t the water fall out of the Earth?” I asked if the reason why water doesn’t fall out of the Earth even on its tilted axis. Then the conclusion was gravity. To be more precise, gravity is the one that pulled the water on Earth into a ball form. What in gravity...

Homework Statement Question: what rate does the water lose gravitational potential energy? Data: I have a pipe that water is flowing through and the pipe has 2 sections. In section 1: - the pipe is 11.9m above section 2 so, h = 11.9m - the velocity of water is $$v_1 = 0.3240ms^{-1}$$...

Homework Statement Determine the factor of safety (in regard to cohesion only) for a submerged embankment 30.5 m (100 ft) high whose upstream face has an inclination of 30°. The soil properties are gtotal=18.85 kN/m3 (120 pcf), c = 37.6 kN/m2 (700 psf), f=10° b) What is the factor of safety if...

Homework Statement You add 1500 cal of heat to a cup of water at 22.5ºC. The water has a mass of 500.0g. What is the final temperature of the water? Homework Equations Q=mcΔT The Attempt at a Solution so i tried solving it by finding the energy of the water Q=(500g)(1.0cal/g)(22.5ºC) Q=11250...

Hi there. We are working on a school science project to compare how different catalysts in water splitting affect the energy/voltage needed to carry out the process. One of our catalysts will be Co-Pi, which is created by adding Cobalt-nitrate to a .1M phosphate buffer solution during...

Homework Statement I have this homework on how a Heron's fountain works. The exact assigment is as follows: "Construct a Heron's fountain and explain what (which variables) influences the height of the fountain." I've already constructed it and it works well, but I'm not so sure about the...

OK, probably not extraterrestrial, but it did pique your interest. :) After my dishwasher recently stopped working I learned that it has a small filter/strainer located just before the water inlet valve so I disconnected the water supply and found this slimy wormlike mass completely clogging...

Homework Statement Homework EquationsThe Attempt at a Solution ## v = \frac { \omega } k ## ## \omega = \sqrt{ kg \tanh (k) } ##I have no idea to guess the graph. I put g = 9.8 and tried to calculate ## \omega ## for different values of k. ## \omega (0 ) = 0, \omega (30) =...

Homework Statement Homework EquationsThe Attempt at a Solution Calculating water pressure using in a horizontal pipe Applying Bernoulli principle, ## p_a + \frac 1 2 \rho gh_a + \frac 1 2 \rho v_a^2 = p_b + \frac 1 2 \rho gh_b + \frac 1 2 \rho v_b^2 ## ## h_a = h_b, v_b = \frac {...

Hello If I blow air containing a fixed kg/m3 of water vapour over anhydrous CaCl2, will the absorbtion rate change if the air temp is different? To simplify, we neglect exotheric heat generated by hygroscopy. Thanks for your answers to this rather simple question.

I recently watched a great video demonstrating the floating water bridge experiment: At around 34 sec, you can see an electrostatic discharge before the water bridge forms. I've read that this is due to the electrostatic breakdown of air between the two beakers.This made me curious about the...

He has been doing it all day, dragging, spilling, putting his paws into the water. I've tried moving the bowl to another location and changing the water but he still keeps doing this. I've managed getting him to drink a bit of water by holding the bowl myself so he wouldn't drag it across the...

[Mentor note: Thread title changed to describe actual problem being presented] 1. Homework Statement Homework Equations The Attempt at a Solution I understand you have to interpolate temperature and pressure of the saturated vapor from the table, since there is no matched final specific...

Hi! I am currently working on a project that includes rotating a water-filled container. The container is NOT spinning about its vertical axis, but about the vertical axis of the rotating disc. I am aware that the surface shape of water in a rotating bucket takes the shape of a parabola when it...