Water Definition and 1000 Threads

Every morning I boil two eggs for ten minutes. My gas canister emptied faster than I thought it would. Now I had noticed that most of the air heated by the gas never touches the pot. I had another burner with half the diameter of the one I had been using. That means 1/4 the circumference...

Hello, At my work I came up with the following question: Say we have a vacuum chamber. Inside the vacuum chamber we have at the bottom a water bath. The rest of the chamber is filled with a air and water vapor mixture. The whole system is placed in a room, is at room temperature and is in...

I have a question about water pressure PSI regarding the presents/lack of slopes. If two identical pressure sensors are set up on the ocean floor at the same depth. One being surrounded by a cone of ramps increasing in height moving outwards away from it. The second sitting on a flat plain...

In a normal aircond system using flexible airduct, assume airflow with temperature & humidity conditions (Tdry=23°C; Tdew=13.4°C; RH=55% ) go through a bended flexible airduct where air turbulence is formed: 1. Can condensation happens at the bended flexible airduct due to air turbulence? 2...

Attached formula can't figure out. H is 12 inches, Q is what I want to know, L is 40 feet, D is 18 inches, A I assume is area of 18 inches, g have no clue what this is. The Culver is 18" X 40 foot long coragated with water 1 foot over inlet and water on outlet 2" lower than culvert and the...

a float with 5 pounds of water displacement is resting on the bottom of a pool of water 10 feet deep. The float is tethered to the bottom of the pool via a string that is pulled tight lengthwise and so is also laying on the bottom of the pool. The string is 4 feet long. If the float is...

Hi, I'm going to make a comparison test between Photovoltaic solar panels and the radiator type. I intend to store all heat with an insulated water tank. Many years ago, I heard about water bottles in a green house with some kind of salts in the water, which allowed the water to store more...

- design of a micro-turbine based on different scenarios of waterfalls - build a system that involves a battery for storing power - test in the lab I have attached a image. I know the image is not very detailed but wanting some advice on this situation. I have done some water calculations on...

How did you find PF?: Google I have an off grid home that uses a spring fed gravity flow water system. The spring is about 200 feet up a steep mountain- and very low flow. The pipe run starts at 2” pvc and eventually is 1.5” pvc. Once down the hill the water flows about 1 mile down an old...

I recently read a paper on using an electric field to drive water autoionizaton. I'm trying to figure out how to use the Laplace equation on pg 9; 4th paragraph; to solve for voltage. I'm also interested in how this equation would change if I replaced the hemispherical tip with a parallel plate...

Hi, I think of a human body as an intelligent biological machine. Could you please help me with the query below? Question: The stomach produces gastric acid and pepsinogen among other enzymes etc. When a glass of water is taken without any food, wow would the stomach react to water? Assume...

I'm studying oceanography and the author of the book that I'm currently reading stated that sea surface water is relatively constant during the day, changing very slowly during the year. He says "this is because almost all the energy received from the sun is used in the evaporation of water"...

Hi! I wanted to do some basic calculations for temperature T on a water-filled pot. I noticed something strange on my calculations, and couldn’t figure out what was wrong... So here it is: The ideal gas formula: k=PV The actual formula Relates equally the product PV with the a constant...

I have a 1" PVC pipe that is 36" long, closed on one end and hooked up to a pump on the other. The pipe has 10 holes each measuring 1/32" in diameter and I have been trying to use Bernoullis equation to find the pressure of the water exiting those holes. I believe the volume of water that will...

So, is water for water waves, what is the vacuum for EM waves traveling in vacuum. I know the analogy can't be exactly perfect because water molecules oscillate in the presence of water waves, but in vacuum nothing seems to oscillate? Or the vacuum oscillates in some way? And no I am not trying...

Homework Statement:: project not homework Relevant Equations:: vectors Hi,I am trying to determine the maximum linear velocity of a propeller tip when subject to flowing water with velocity ##\vec V##. For simplicity, I will assume that rotational inertial is negligible. The drawing below...

As per the title, I'm trying to research how the thermal breakdown (thermolysis) of water works. I gather that you need circa 3000°C to get it to break down, which is a lot, and I'm curious as to how pressure might affect this. I know that pressure affects the boiling point of water, and as...

I've been researching water bridges and electrowetting to learn the effects of electric fields on water molecules but something continues to confuse me: if polar molecules can only rotate in an electric field, how is the water moving? Anyone familiar with this phenomenon? Any help is greatly...

Let us solve it for Cu at pH =8. I found this Pourbaix diagram. What is the electrochemical potential I should use to check that Cu is there the stabel form. Should I check for all values of E between the blue lines at pH = 8? How can I measure the E value in reality?

For my project, I need water waves of all frequencies to move at the same speed. I read this article, but struggled to grasp some concepts. The key idea of the article is that a raindrop hitting a water surface basically creates a pulse containing all the frequencies, and since the water is very...

I'm creating a simulation of the shallow water wave equation in MATLAB. I'm using the equations: $$\frac{\partial v}{\partial t}=-g\frac{\partial \eta}{\partial x}$$ $$\frac{\partial h}{\partial t}=-h\frac{\partial v}{\partial x}$$ Iteratively updating the velocity from neighboring heights...

Hello! I'm having some problems solving a task.. "Ice with temperature -12°C is used to cool down water from 98°C. to 55°C. . Specific heat capacity for ice = 2097J/kgK, Secific heat capacity water: 4180 j/kgK. Heat of fusion for water is 334,4kJ7K. The mass of the water is 20kg." ∆T water =...

Calculation of the potential electrical energy generation of a siphon pipe, emptying an enclosed reservoir and end of siphon pipe connected to a pelton turbine with efficiency of 75% Known inputs: Height difference of siphon(Hd) = 4,5m Height lift of Siphon (Hu) = 6m Total siphon pipe length...

Is it true that water has no shearing force but it can be sheared? If so, would the sides of a glass holding water shear the water?

What happens to the buoyant force at the surface of the water for an object? The buoyant force should be greater than the weight of the object if the object were to float up but once the object floats to the surface, there is no more acceleration upwards which means the buoyant force = weight of...

I have no engineering background so apologies if I'm trying to create alchemy without pumps. I need to empty 10 000l reservoir 4 times a day into a larger vessel, which is slightly lower, but I first have to cross a 9,5m high barrier (site is located about 15m above sea level) I gather the...

A while back a was messing around in the shop, and ended up making this water pump that uses only heat to pump. The two check valves are the only moving parts. Here is a drawing of what it looks like inside. Here is another drawing of what I believe it is doing in its cycle. The system...

Dear everyone. I wish you all happy and healthy after this Covid pandemic.Last week i used ethanol mixed with raw materials, got the solution ( suppose ethanol + oil + wax +etc ). And I add water to that Ethanol Solution above with ratio 1/1...inside the mixing solution it formed a resin ( slime...

Hi i want to understand effects of viscious drag of water in fixed cross section open channel flow. My understanding is water viscosity and channel surface create drag opposing movement of water, changing kinetic energy of water to heat. Result is warmer water and slower water flow. If the...

I am trying to find out what the smallest hole water will flow through. not a molecule of water, just water in general. Here is an example. I have a single walled cube that i 3d printed. When i put water in it, it leaks between the layer lines. I want to find out what the spacing between the...

Hello Sorry for my English... We approach slowly (in a quasi-reversible way) an electrical charge of a glass of salt water. Some ions arrange themselves in the glass. What can we say about entropy of this transformation? Bernadette PS: My reflection comes from reading an old physics book...

I shot some high speed footage of phenoxyethanol dissolving into water and observed some fractal/dendrite like patters at the edge of thin droplets that float on the surface of the water. I suspect that the water under the droplet becomes saturated very quickly as the phenoxyethanol is not...

Consider mixing ice water with the hot water and vice versa so that the two reservoirs are closer to the same temperature. What will happen to the mechanical/thermodynamic efficiency and ideal Carnot efficiency of a heat engine?

Hi, I was wondering, what is my apparent weight in water? For example, when I tiptoe on land, my calf muscles are pretty much lifting all my body weight. But if I were to tiptoe with just my head out of the water, how much weight would my calves be lifting? And as I move to shallower water, how...

a tank is filled with water up to its brim a hole was made at the bottom of tank find time taken to empty tank if water flows at rate of 2h kg/s where h is height of liquid column and is equal to 20m radius is equal to h/2 [Moderator's note: moved from a technical forum.]

Hi everyone, I'm trying to solve the following problem but can't quite get my head around it. I have a pipe of length, L (m), diameter, d (m), the pipe walls are thick (multiple meters). I know the inflow temperature of the pipe, say, Tin (K), and the pipe's external wall temperature, Tw. I...

When calculating water pressure drop in chilled water pipisystem (closed circuit) we always use Hazen Williams equation as follow:- but in case of calculating water pressure drop in cooling tower piping system (open circuit), shall we modify something in Hazen Williams equation or shall we use...

Hi I want to remove chloramines from tap water and I read it's possible to do by adding ascorbic acid in the water. Here is the source: https://en.wikipedia.org/wiki/Chloramination#Removing_monochloramine_from_water So I was wondering what substances are the chloramines being changed into (the...

What do you think of purifying water by using a vortex / law of gravity? Here is what I am thinking: 1. Build a funnel-like jar, clog it on the bottom and fill the jar with water. Now wait for several hours. 2. Unclog the bottom, wait for a few seconds (depending on the size of the jar) and...

My query in only on the highlighted part...c.ii. Find the question below; Find the markscheme here part c(ii) does not seem correct as i have; ##A_1=0.5 ×(0.65+0.84)0.3 ×2=0.447m^2## ##A_2 = 0.65 ×1.6=1.04m^2## ##A_3 = (0.3146 × 1.6)2=1.00672m^2## Total surface area =...

Hi I want to to make 100% (or close to it) pure water and I guess distillation is the way. I know there are VOCs that can vaporize at different temperatures. And then we have the chloramines in our tap water. When water gets vaporized does the chloramines vaporize too? Can anyone provide some...

Water heater has the effect 2kW and is filled with 2kg water, with a heat capacity of 4,18Kj. The water needs to be warmed from 300K to 400K. How much time does it take for it to warm up? I've tried to solve this, but it seems that i need to know the heat capacity of the water heater, which i...

I think the water in the bowl of water will boil first because the glass won't conduct the heat instantaneously, and hence the water in the glass will boil after the water in the bowl. Is this correct? I am guessing this is a trick question and the water in both boil at the same time, but I...

Hi, I have been calculating a series of hypothesis for some aquariums/tanks situations, using heat transfer equations (conduction, convection, radiation, evaporation) Typically we have aquariums that run at higher temperatures than the surroundings in winter and lower temperature than the...

Hello, human people's. I noticed a strange phenomenon while playing electrochemistry. - i used 2 strips of aluminum foil as electrodes in sodium sulfate solution, 1 for positive terminal and other for negative. Applied 5 volts, essentially zero current flew. - i used 1 strip aluminum for...

I tried using the formula for the refraction of a spherical lens ##\frac{n_1}{p}+\frac{n_2}{q}=\frac{n_2-n_1}{R}## consider each slab as a spherical lens with curvature ##R=\infty## and by doing that I get ##\frac{1.33}{10}+\frac{1.5}{q}=0\Leftrightarrow q\approx -11.3 cm##. Since the piece of...

It has to be going somewhere! The boiler pressure drops by about 0.5Bar every few weeks. I've looked at the radiators for signs of small leaks but I haven't been inside the boiler as yet because I only recently terminated a maintenance contract with British Gas. BG were not interested in a leak...

My work Q= 0.025 * 4190 * (34-100) = -6910 but on chegg but did they do Q= 0.025 * 4190 * (100-34) = 6910. I thought the initial is 100C and final is 34 because it goes from 100 to 34

Hi, The solution for this question is thermal energy lost= thermal energy gained 0.200x450x(300-T)=1.0x4200x(T-20) T=26 degrees celcius. However, I am struggling to grasp why (300-T) is used. I have always known a change in something to be final - initial. Therefore change in T= Final-...

Hello, I am in the process of trying to figure out the conditions required to heat an aquarium using the surrounding air. The first step is to figure out how to calculate the room temperature required to keep the aquarium at a desired temperature. I was drawn to this forum when I ran across...