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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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1answer
13 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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0answers
41 views

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

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
35 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
31 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 ...
7
votes
2answers
105 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
49 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
79 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
37 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
92 views

What goes on inside a kettle if you can't get to it after the whistling begins?

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
29 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 ...
1
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0answers
32 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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0answers
25 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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0answers
23 views

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 ...
1
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1answer
44 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
43 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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0answers
18 views

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
34 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 ...
1
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0answers
15 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
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0answers
50 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 ...
3
votes
1answer
47 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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votes
1answer
41 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
vote
0answers
24 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 ...
0
votes
0answers
23 views

How do I go about calculating the energy yield of an explosion that takes place underwater?

I'm confused here. I'm aware that underwater explosions are far more dangerous due to the water's incompressibility, which allows the yield to move along and hit a person head-on without any of the ...
2
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0answers
33 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 ...
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0answers
26 views

Which among the water cools first at same temperature conditions? Saline water or fresh water? [duplicate]

Which among the water cools first at same temperature? Saline water or fresh water? and why?
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0answers
43 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 ...
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1answer
69 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
183 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 ...
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votes
1answer
36 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
votes
1answer
48 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 ...
1
vote
0answers
8 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
votes
0answers
43 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
votes
1answer
36 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
votes
1answer
26 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 ...
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votes
1answer
38 views

how to get high humidity and low temperature in room [closed]

I want to start mushroom farm for that I have to maintain high humidity and low temperature for that ,So i finding solution for how to get high humidity and low temperature at low cost.
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0answers
89 views

thermal debroglie wavelength

A recent physics exam at the pre-university level has questions about water-ice forming on the surface of interstellar dust particles. One expression presented in the exam is the thermal debroglie ...
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0answers
15 views

Why is the critical seperation distance between two plates for capillary condenstation to occur negative?

I am currently reading this paper: Auto-adhesion model for MEMS surfaces taking into account the effect of surface roughness Can be found here: https://www.spiedigitallibrary.org/conference-...
1
vote
2answers
44 views

If you are ontop of a giant heavy object that is falling from the sky, is it possible to jump and roll at the perfect time to survive? [duplicate]

I don't know if gravity or the speed of the drop would prevent us from jumping, but would something like this be possible? If it's not possible on the ground, is it possible in the ocean? I'm sorry ...
76
votes
1answer
6k views

Why does soaking a fabric make it more transparent?

It's a well-known fact that when one soaks a thin piece of fabric, it will often become more transparent than it was before. What is the reason behind this? I can't put glass behind the fabric and ...
1
vote
0answers
35 views

Simulation of circular wave propagation in water - equation

I am trying to develop a simulation of circular water waves with CUDA and OpenGL. Scenario: there is a center of propagation (e.g. when a stone is dropped into water) in a limited area filled with ...
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1answer
20 views

Surface tension molecular theory

How does the surface of water behave like a stretched membrane? What's the cause for that? I know that the surface molecules experience a net force downward so there is dense layer of water molecules ...
3
votes
1answer
89 views

Minimum size of a “water star”

So I had this weird idea the other day. We know that stars form from simple matter (dust, gasses, etc) forming a gravity well, attracting to each other, until the amount of mass and density in the ...
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votes
2answers
27 views

Does the density of water affect the speed of sea waves?

In the case of light waves, the denser the matter, the more slowly they propagate. Do the water waves behave identically?
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0answers
35 views

Will flow ever reverse or stop if we increase resistance in this pipe scenario?

This is the third question I decided to ask on this topic. I've received some beautiful and detailed answer in the previous posts, so if you want to take a look, you can do it here and here. The ...
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votes
1answer
76 views

Where will pressure be stronger in these 2 pipe scenarios?

I initially started to be interested in fluid pressure and pipes to learn electricity. It seemed the only way I could help my head to get around some electrical concepts. That's the reason of my ...
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0answers
56 views

Can steam freeze via adiabatic expansion?

Context: At the end of animation movie Steamboy, a huge steam engine's pressure vessel breaks, which results in the escaped steam freezing to ice. I've been thinking about this -- is it really ...
0
votes
1answer
61 views

Emptying two water tanks at different levels with priority through same outlet pipe

The requirement here is something related with emptying two water tanks at different levels giving priority to one over the other. Real life scenario hers is about usage of harvested rain water which ...
0
votes
0answers
41 views

Water moving up in a pot of soil

Assume I have a pot of dry soil. Now I add water to the bottom of the pot. What happens is that water will move up the soil. No more dry soil in the pot. I am not sure what precisely is going on here,...
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1answer
26 views

Tracking down a citation for the dynamic viscosity of sea-water

I inherited some computer code that estimates the dynamic viscosity of sea-water from the water's temperature. The formula in the code uses is $$\mu = 2.414 \cdot 10^{-5} \cdot 10^{\frac{248.8}{T+133}...
1
vote
1answer
77 views

When boiling water, why does the water level decrease?

When boiling water, the level of water decreases and will disappear after a while. I guess this has something to do with the condensation of water vapour into the visible white "steam" or "cloud". ...