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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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12
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4answers
2k views

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
24 views

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 ...
3
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0answers
72 views

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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1answer
66 views

why does cold water have Translucent visibility? [closed]

If ice is to formed soon, why ice Does not have Tranparent vision.
2
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1answer
172 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 ...
1
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1answer
93 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 ...
0
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1answer
59 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 ...
11
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1answer
232 views

Why do random slabs stay dry in the rain? [closed]

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
99 views

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 ...
0
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1answer
117 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 ...
3
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4answers
881 views

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
246 views

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 ...
1
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1answer
178 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
152 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 ...
-1
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1answer
9k views

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?
2
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1answer
103 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 ...
2
votes
3answers
792 views

Will water in a vacuum evaporate continously?

Will a vacuum chamber that is maintained at 0.1 Atmospheres with an open water container inside ever reach 100% humidity of the remaining air, so that no more water evaporates or will water ...
2
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3answers
105 views

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?
15
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2answers
343 views

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?
1
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1answer
86 views

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 ...
0
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1answer
39 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 ...
0
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2answers
82 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?
1
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1answer
411 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 ...
0
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1answer
38 views

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 ...
10
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3answers
235 views

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 ...
3
votes
1answer
68 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 ...
3
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0answers
88 views

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
60 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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3answers
188 views

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'...
0
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1answer
62 views

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 ...
3
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0answers
400 views

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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1answer
357 views

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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1answer
75 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
122 views

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 ...
0
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1answer
46 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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0answers
171 views

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 ...
3
votes
1answer
123 views

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 ...
2
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1answer
313 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 ...
0
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1answer
74 views

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 ...
1
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0answers
38 views

Better to stay in the open or in the water during an earthquake?

I tried looking around on google but couldn't really find any good information. For arguments sake, say I am in a field with a river intersecting it. If an earthquake occurs and I am near the ...
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0answers
44 views

How much electricity does it take to create hydrogen from water depending on the water's pressure?

Imagine creating bubbles of hydrogen and oxygen underwater at a particular depth using electricity. Then reusing the energy of the bubbles going upward to the surface ( buoyancy ). How is the energy ...
0
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0answers
210 views

Data for plotting phase changes in water

I want to plot phase diagrams of water that show its density, heat capacity, and entropy as it undergoes various first order (discontinuous) phase transitions with increasing temperature. I'm ...
6
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1answer
3k views

Why do tea bags sometimes float and sometimes sink?

Over the past few weeks, when making tea, I've noticed that after filling the mug with water, the teabag that has been placed inside sometimes floats to the top, and sometimes sinks/stays at the ...
5
votes
4answers
229 views

What would happen to a 10 meter sphere of room temperature water if released into space?

Imagine that we had a space station with a relatively large hangar, and we allowed a ball of water to accumulate that had a 10 meter diameter and a water temperature of 20C. While the hangar is ...
0
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1answer
189 views

Above-the-ground pool slope pressure calculation

I'm not sure this is the right place to ask this "homework" question, but I have a real life problem that requires calculation and I do not have the math knowledge to make them myself. I have bought ...
0
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1answer
682 views

Turning water to ice in vacuum

My 9yr old is inspired to try to make ice with a vacuum after seeing an exhibit do just that at room temperature at the Exploratorium in San Francisco. He's using a motorcycle vacuum brake bleed pump ...
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0answers
11 views

Effect of humidity on removing excess charge from objects [duplicate]

The usual answer to the question "why electrostatic discharge happens more often on dry days" is that water - due to its polarity - has the tendency to remove the excess charge. But I do not ...
2
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0answers
69 views

Why aren't canal locks nearly impossible to open?

So I've just been watching a TV program where two people open a canal lock, and it occurred to me: aren't you pushing against the entire pressure of the river when you push the lock doors open? Why is ...
0
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1answer
81 views

Snow flake symmetry and angle of water molecule

I read in various places (e.g. Feynman Lectures) that the bonding angle of water molecules (ca 105 degrees) is related to the 6-fold symmetry of snow flakes. I understand that in ice, the water ...
-1
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1answer
28 views

Will a series of 5' vertical tubings filled with water create a vacuum at the top of the tube that is equivalent to one 30' length of tubing?

It's been proven that a vertical 30' length of 3/16 tubing filled with water creates maximum vacuum at the top end. Basically, the tube is small enough in diameter that no air passes and the weight ...