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Questions tagged [water]

Two Hydrogen atoms covalently bonded to one Oxygen atom. One of the more common compounds on the surface of the earth.

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Does hot water turns to ice quicker than cold water? [duplicate]

I kept hot water by mistake in freezer and noticed that it turned to ice pretty quickly and then I simultaneously put hot and cold water in freezer, still the results were the same. How so?
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Forces acting upon body on impact with water

I am investigating the water-entry of a steel ball-bearing at different speeds. Ideally, I would like to model (to an extent) the forces experienced by the ball bearing as it transitions from air to ...
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What is the most energy efficient way to heat and maintain the temperature in a tank (vertical column) of water with 4 heating elements? [closed]

1) Given the following tank of water with four heating elements in two groups, A and B, where the elements in each group are switched on and off together, what is the optimal way to heat the tank of ...
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Why does using deuterium mass for hydrogen improve convergence of molecular dynamics simulations of water?

I've come across many papers performing ab initio MD (Carr-Parinello or Born-Oppenheimmer) simulations of water that use the deuterium mass for hydrogen. And they state that this helps improve ...
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Water climbing up sandpile against gravity?

I have seen a bucket full of water, and sand in it so that the sand just creates a pile just above the water level, and the sand that is above the water level is first dry. As time passes, the water ...
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Could you have sand pipes like water pipes? [closed]

It's common knowledge that sand behaves like water when in small grains. So can you make a pipe that carries sand in the same way pipes carry water? If not, is there another way you could?
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1answer
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How to get constant water pressure in a circular distribution pipe?

I have a circular 3/4" pipe( 62" in diameter). It has 11 tee outlets, 3/4"x3/4" to 1/2", which each have a 1/2" hose that funnels the water downward. The pump(400gph) is pumping the water vertically ...
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Using convolution to simulate acoustic dispersion in shallow water

Background I'm a marine biologist who's trying to wrap my head around shallow water propagation. I'm interested in how acoustic dispersion (as described by Pekeris' waveguide) alters how sounds ...
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why does cold water have Translucent visibility? [closed]

If ice is to formed soon, why ice Does not have Tranparent vision.
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1answer
53 views

Liquid water has no rotational spectrum but does absorb in the microwave region

I came across a wikipedia page and it states "Liquid water has no rotational spectrum but does absorb in the microwave region" water molecules rotates while in transit which causes friction so it's ...
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1answer
27 views

Hydroponics Recirculating water flow [closed]

I hope this is the right place to post this, and help would be appreciated. I've have been working on a multi tower hydroponics system for the past couple of weeks. I'm currently trying to figure ...
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1answer
38 views

At what rate does the typical human body sink in a swimming pool? [closed]

Let's say I'm $1.8\ \rm m$, $70\ \rm kg$ with a fairly typical male body shape. I hold on to the side of an otherwise normal but very deep swimming pool, then lower myself so that the top of my head ...
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Why do random slabs stay dry in the rain?

The image below shows the slabbed area I can see from my work window Whenever it rains some of the slabs stay dry however, it is never consistent which ones. Can anyone explain why this happens to ...
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2answers
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If it was heated up enough, could water-soaked wood in a vacuum catch on fire? [closed]

Obviously you can set a damp piece of wood on fire- not exactly revolutionary. I specifically mean if the wood was in a perfect vacuum. It doesn't matter where the heat comes from-just say the amount ...
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1answer
99 views

Is it possible to create weighing machine with water indicator [closed]

I want to create a weighing machine that works with water. After researching on Google I got this. $1$ $\text{cm}^3$ of water weights $1$ g. So, with that equation I'm planned to create this below ...
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Since water boils at room temperature in a near vacuum, is it possible to use this to generate electricity in some way?

This may be a blatantly obvious question but I've never heard about such a thing happening. Could this be possible in some way using a vacuum chamber to boil the water and spin a turbine?
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1answer
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Estimating the minimum hole size for leakage through a sealed membrane [duplicate]

Suppose I have a thin membrane sealed onto a flat surface along its perimeter, and there is water between the two surfaces with a certain pressure $P$. I would like to know, if I made a circular hole ...
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1answer
61 views

Why is water inside a vacuum chamber not boiling?

I have a vacuum that shows a max vacuum gauge reading of 23"Hg when connected to a chamber. When placing room temperature water inside vacuum, the water doesn't boil. I have seen this chart before ...
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2answers
39 views

Is it possible to create circulation of water in bypass pipe without water pump?

There is a pipe of 32mm in diameter. Water flows from left to right. There are two branches in that pipe. To one of them connected input of water heat exchanger, to another - output of water heat ...
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27 views

How does a field behave inside of a spherical cavity?

Suppose you have a spherical cavity, with a flow of a fluid ( in particular water), entering it from one side. What will happen to this flow? Will it create turbulences? Will speed increase? Will ...
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Heating and cooling

So I have a water system that gets warm say 70C I want to run it through a radiator which has a cooling fan which will cool the water, I am not using refrigerant just air being blasted by a fan, how ...
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Why does ice form when you break the seal on a very cold bottle of water? [duplicate]

I put a sealed bottle of commercially available drinking water in a freezer and let it get really cold, but not frozen solid. The water is not carbonated. Then I remove the bottle and place it in a ...
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1answer
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Is it a coincidence that 1 liter water has a mass of 1 kg while 1 cubic meter has 1000 liters of water?

1 Cubic Meter has 1000 liters of liquid. Meter is a unit independent of Kilogram. Then why does 1 liter of water at max density (4°C) have a mass of 1 Kg?Is it a mere coincidence?
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Does water height in mixed semidiurnal tide systems change in a sinusoidal pattern between peaks?

I'm writing a bit of plotting software that takes the time of high tides and low tides and interpolated what the height should be between these times. I know that diurnal tidal systems follow a ...
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1answer
38 views

Perturbation Theory of Liquids: Weeks Chandler Anderson Model

To put simply, what is the big deal about the WCA model of describing solutes in liquid theory? I understand that the WCA model splits the potential into a repulsive force component, and an attractive ...
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3answers
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If a drop of water hits something at bullet speed, will it damage it?

I can't find this anywhere. If a drop of water hits a glass for example, at the speed of a bullet, will it damage it? Or will it just make the same as a raindrop?
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Why does the water pressure initially drop then stabilize when pressure testing a valve?

Sometimes the dropping goes on so long(10-15 minutes) that the test is thrown out and the valve is opened and filled with water for a longer period of time. Pressure testers claim that it is because ...
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Only sea water appears blue in color, why this is not happening in river water?

Is the salt in the water the reason for scattering sunlight into blue?
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1answer
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How is water a worse electric insulator than air?

I know I must be missing something here. Water has a much higher permittivity than air, which means it has higher (distributed) capitance. That means it can more effectively convert an electric field ...
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1answer
31 views

Calculating the specific heat capacity of water

So for a thermodynamics assignment I'm doing, I need to build a solar oven and then use that to gather data. That bit's fine. The problem I'm having is that I need to use this data to calculate the ...
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2answers
65 views

Is it possible for a floating object to rise in the water the water level rises? [closed]

Is it possible for a floating body to rise further out of the water as the water level rises around it? What conditions need to be met and what properties does such an object need to have?
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1answer
76 views

Force and momentum of water striking a water wheel?

Imagine water striking a water wheel. We can find the torque applied by calculating the force of the water and multiplying by the distance from the center. To calculate force, we can use the formula ...
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1answer
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Rate of water condensation at different temperatures

DOES the rate of water condensation increase by decreasing temperature way further than dew point or the rate will be the same to that at the temperature slightly less than dewpoint for example is the ...
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3answers
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Why do distinct temperature layers form in bodies of water?

This may not be the correct place to ask a question about limnology (which I just found out is the science of lakes) but it seems like the place most likely to produce a good answer. In my diving ...
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1answer
51 views

Dispersion of Water: A Swimming Pool Conundrum

The following question came up in a swimming pool: The pool has a jet that releases water below the surface. When I put my right hand in the water, several feet away from the jet, I can feel the ...
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0answers
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Is $H_2O$ the only compound which has a density anomaly? [duplicate]

My question is simple: are there any elements, compounds or materials other than water ($H_2O$) which have a density anomaly characterized by a turning point in the $T-\rho$ curve?
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1answer
47 views

Water Bottle Condensation

My friends and I were at a party last night and we were crushing empty water bottles until the cap popped off and water vapor came out. I have two questions regarding this phenomenon. From previous ...
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What goes on inside a kettle if you can't get to it after the whistling begins? [closed]

Let's say you can't get to the kettle for a few minutes after the kettle starts to whistle. Presumably the temperature of the water inside the kettle is still rising, past boiling point If there wasn'...
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1answer
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from a spectrometer, how to determine unknown substance in water?

I created a spectrometer that produces nice clean wavelengths, I calibrated it using a fluorescent bulb. from that I can create a graph from the data. after which, I use the known position to of ...
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0answers
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Can water drip from a capillary tube top? Perpetual motion?

In a normal capillary tube (ex: tube A), where the water doesn't travel as high as the tube's height, h, the meniscus formed is "normal" (concave, as seen in tube A). From previous posts, I ...
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Capillary Perpetual Motion

Can anyone figure out what is wrong with this perpetual motion machine? What part of it violates physics? I found it on a website a while ago, and I couldn't figure out what was wrong with it. Thanks, ...
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Air bubbles underwater after creating a vacuum

So I'm playing in the pool with my daughter and she has one of those squirt gun tubes, I'm messing around with it and realize if I put my finger Over the Hole and pull it hard enough underwater I can ...
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1answer
46 views

What does the motion of water in tsunamis look like?

This is what normal wave motion looks like. Do tsunamis that travel at 60mph look any different?
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1answer
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How many elementary particles are contained in a molecule of $H_2O$?

I was wondering about how many elementary particles form up one molecule of $H_2O$. What I thought of is the following: Hydrogen : 0 neutrons, 1 electron, 1 proton; electron is elementary and proton ...
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Scaling a Water-Cooled Condenser Coil

I am working on a project that involves purifying water through distillation. After the water is vaporized, it will be sucked into a coil, like the one pictured below, so it can condense. I was ...
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1answer
39 views

Calculating gas pressure following water transformation to vapor (in contact with boiling oil)

When water falls into a pot of boiling oil, it turns into vapor, and in an enclosed space this will create a higher gas pressure. Is there a way to figure out how high of a gas pressure there will be ...
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Water movement in variable diameter bent capillary?

So, I recently learned that if a capillary tube is bent in an upside down U shape, the meniscus formed will be convex (towards the ground). Furthermore, the height (shown as h) traveled by the water ...
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Why does a salt water solution have a higher coefficient of thermal expansion (i.e. expands more) than distilled water?

I have found several different sources of data which show that a solution with a higher concentration of salt has a higher coefficient of volumetric thermal expansion than a lower concentration salt ...
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1answer
80 views

Meniscus in U-shaped capillary?

What does the meniscus look like for a U-shaped capillary? From similar questions, I learned that the total height (labeled as h) reached by the water in the un-bent capillary is less than the total ...
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1answer
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What type of heat is efficient to evaporate water?

I found that there are several type of heating element in a hair dryer, but basically I mainly classify them into two ways of heat transfer: Radiation and Conduction. The conventional hair dryer uses ...