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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How to harvest water passivley?

I have been reading recently about methods to collect moisture from the air passively and turn it into water. However, is there any attempt currently for small-scale water harvesting? Methods I have ...
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How does gravity affect the formation of vortices?

Context: I understand the axis of vortices can form in any direction (like underwater used by fishes). However, in large vortices in water bodies, for example, in a closed water bottle, the centre of ...
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Pressure difference between two connected bodies of water

My friend has a large swimming pool connected to a much smaller jacuzzi tub. Both bodies are filled to the same water level. There is a hole about 1” diameter between the two about 18” below water ...
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Physics of an electrostatic water pump, is it even possible?

I have been trying to figure out how to approach this problem. Imagine a cylindrical shell made of insulating material. The top surface has a hole in its center, with a pipe extending up. The bottom ...
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In winters, is sea/ocean warmer in the mornings compared to the rest of the day?

My friend claims: "Ocean water is warmer on winter morns than at other times of the day". I claim he is wrong. He says it has to do something with the mixing of surface and deep waters but ...
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If ice melting does not change the water level in a container - Why is everyone afraid of sea levels rising drasticing from ice sheets [duplicate]

I saw this experiment and am now wonder what I am missing in understanding if ice sheets melt why should they causing the sea levels to rise if it doesn't in a container ?
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At what velocity and pressure will water enter a Vacuum chamber?

Assuming we have a chamber with a near-perfect vacuum, and we are at sea level. If the chamber is 4 feet long and 2 feet wide, we forced it underwater and opened a valve that was 1 inch in diameter to ...
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Does every Goldilocks planet in various solar systems inevitably have massive amounts of concentrated $\rm H_2O$ meteors?

I’ve always been fascinated with the Anthropic Principle. Our universe seems to have our Chemical, biological, and physical properties/laws designed to favor the existence of life. Although the human ...
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Formula for how long it takes ice to melt based on its shape

You're given a hunk of ice with some shape in a room, and the question is how long it will take to completely melt. Let me be clear on a few points. Obviously, there are a zillion factors that will ...
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Vaporization - phase diagram

I understand what boiling and vaporization is. But what puzzles me is the phase diagram. When I spill a glass of water in my room, it will soon vaporize, though there was normal atmospheric pressure ...
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Does a thin sheet of water reflect sound just as well as a thick layer of it?

It is very difficult to hear underwater sounds from above the surface of a body of water. This is suggested to be due to the speed of sound being very different in air versus water, leading to most ...
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Differences in interactions of light with different mediums

I am trying to figure out this problem, I apologize in advance if the question is silly. If i am correct sunsets are red because red light doesnt get diffounded as much as blue light, which eventually ...
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Water boiling point at room temperature (30 C) and thermodynamic tables

We all know that water boils at $1\rm\,atm$ at $100°\rm\, C$. But if we maintain the water temperature at $30°\rm\, C$ and instead let the pressure drop (in a vacuum chamber) to around $0.3\rm\, bar$, ...
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Why does water collect under a book my laptop is sitting on?

Sometimes I sit in my bed with a blanket over my lap. On top of the blanket I put a hardcover book. On top of the book I will be working on my laptop. So we've got: Laptop Book Blanket My lap ...
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How to control the balance of a floating object?

I have this 3D printed object which I hope to float water. I added my printed object to a piece of foam (Glued) and then gently put it on the surface of the water. Every time I put it, it flips over ...
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How to measure water height thickness on infinitely flat surface with constant layer of water?

How would it be possible to measure layer of water on an infinitely flat surface, with every time different, but constant layer of water? I'm trying to measure thickness from $1\rm\,\mu m$ to $5\rm\, ...
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Would "Energy Vault" gravity battery work in water?

To be more specific, will one block lowered into water release the same amount of energy as in air?
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Why water bearing clouds come black to the eyes? [duplicate]

Why water bearing clouds come black to the eyes? As far as I know mist is whitish, and rivers and seas are relatively transparent...Why the water inside the cloud absorbs all wavelengths?
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Difference between the wave forms in the water and in the Young double slit experiment

We can observe when we cause a slight disturbance at two points on the water surface which is intially totally undisturbed , it will form water waves which would look like as shown in below image: we ...
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Smallest pool to form tidal wave

Tidal waves form in the ocean, while not in my swimming pool. I wonder what's the smallest swimming pool is like to form tidal waves. It's true that tidal wave always exists, let's assume we want a ...
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Is the velocity in parallel pipes the same as a single pipe according to Bernoulli's equation?

This system pushes water through a nozzle. I can use Modified Bernoulli's equation to calculate the nozzle velocity as such: $$V_3 = \sqrt{2g\left(\frac{P_1}{\rho g}+ z_1-\Delta h_L\right)}$$ where ($\...
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Are water molecules at the surface closer or farther apart than the molecules inside?

My lecturer says that since the energy of the molecules on the surface is higher (less negative), then at equilibrium there will be less molecules on the surface, hence the molecules on the surface ...
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1600 gallon water tank 50 feet above and 1000 feet away from use point, psi? [closed]

What size pipe should I use to obtain 40-50 psi for use in the house? I would use a poly pipe or pvc from the tank to house
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2 answers
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Why does the vapour bubble in an inkjet printhead collapse so fast?

I am studying the inkjet printer in detail. I have come across thermal inkjet printing technology (bubble inkjet technology) and this short discussion below. We create a water vapour bubble by heating ...
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Does water evaporate more quickly from ocean if air is cold or hot?

If a colder air mass blows over warmer ocean water, does evaporation of water happen quicker than earlier when the air was warmer?
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Generating hydrogen from moving water

I am a high school student and I have planned to participate in national innovation award of my country. In this competition, prototype of innovation is needed. I have created a design but I lack ...
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Ability of some porous solids to tentatively sit on water for a while before sinking

How does a porous solid such as the cereal "Wheatena" manage to tentatively sit on water for a while before sinking? I assume it initially somehow evades capillary action, perhaps through ...
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7 answers
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Is submersion in a canal a good way to shelter from a nuclear strike?

I live 1.5 miles from the center of a city in a nuclear-armed country, and an adversarial country has just put its nuclear forces on high alert during a time of extraordinary geopolitical tension. I ...
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When water is evaporated and the particles with a little more energy breaks away, Why do the molecules left have less motion?

From Feynman's Six easy pieces: Then a molecule leaves it is due to an accidental, extra accumulation of a little bit more than ordinary energy, which it needs if it is to break away from the ...
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Can hydrogen be generated from flowing water?

Imagine water (water is made conductive using salt) flowing at a great speed is passed through a high magnetic field. Then due to changing flux , can we induce electric current in water? If electric ...
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How can salt "grow" up the wall of a vial with very salt water?

In my kitchen I have a vial with very salt water, and some food coloring. It's been left to slowly dry out for a year or so. Recently, salt (presumably) started growing up the walls of the vial. Does ...
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Is water thermolysis via microwave heating feasible?

Can water molecules be heated enough (2500°C? 3000°C?) to be separated into hydrogen and oxygen by thermolysis via a microwave emitter? I've searched around but it appears this hasn't been researched? ...
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Steam Produced by Induction Cookers

I had recently noticed that induction cookers produce much more steam than normal gas tops and when I set the setting in the induction cooker to 'steam' it produces ever more steam. I used the same ...
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2 answers
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Why isnt a taller object more buoyant?

If an objects buoyancy is dependant on the difference in pressure between its two faces, why arent taller objects more buoyant since the pressure difference is larger?
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1 answer
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Why is the Ocean Blue? [closed]

I'm writing an article on the physical property that binds Music and Water -- Harmonics. I understand that the blueness of ocean water is due to the three vibrational modes of water (i.e, symmetric, ...
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How can plots showing the mixing line for Schmidt-Appleman criterion (for aircraft contrail formation modeling) show liquid water below triple point?

In trying to understand the Schmidt-Appleman criterion for contrail formation. There is one aspect that I cannot make sense of. In many papers that describe the criterion they include a plot as shown ...
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Why bubbles are not moving up in a kettle full of water?

When I boil water in the kettle, many tiny bobbles appear after a short time, long before boiling (See video here). They don't seem to come from the bottom of the kettle, like in boiling, but from ...
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What is the relationship between the concentration of potassium chloride in water and its specific heat capacity?

I am curious about the effect that adding potassium chloride to water in varying concentrations has on its specific heat capacity. I have been unable to find any online information about this? ...
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1 answer
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How does boiling take place?

When we heat a liquid (suppose, water) , it's molecules become energetic and gain more and more kinetic energy hence move away from equilibrium position and volume increases. But, When heat is added, ...
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Who first modelled water as a tetrahedron?

Who first modelled water as a tetrahedron? In this model the oxygen is at the center and the two hydrogens are at the vertices (I think, or maybe somewhere along the edges?). Source This gives the ...
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Hydrostatic pressure of watertank, and freezing conditions

I am currently using a hydrostatic pressure sensor inside of a water tank and converting this to liters as per the dimensions of the tank. This works great, however I have hit a challenge. In ...
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1 vote
1 answer
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Water molecule $\text{H-O-H}$ angle in electrostatic field

An image showing water molecule within a cylinder with positive charge on the inside and negative on the outside. To what extent will the $\text{H-O-H}$ angle adjust itself to the electrostatic force? ...
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Bird drink feeder -- How to make water come out automatically and stop coming out from a bottle? [duplicate]

I am watching a video about a DIY bird water feeder. https://www.youtube.com/watch?v=q6EitavSRNg In the video, three holes were punched from the plastic bottle in a triangular pattern, and then the ...
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Pressure required to create enough suction to pull water up height h

I am trying to find out how much pressure needs to be added to a system to draw up water. The system is essentially a 5-gallon water bottle with a manual hand pump, like this: https://www.terapump.net/...
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-3 votes
3 answers
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If water is a bad conductor of heat (C=4200J per kg per K), why is it used as coolant/water cooling? :O

According to what I’m seeing, water is considered a bad conductor of heat. Colloquially, isn’t water supposed to conduct heat well as it’s used to transfer heat to a radiator, in everything form a pc ...
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4 answers
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How does boiling work?

Let's assume that the exact boiling point of water is 100 degrees. Now I have a stovetop and a pot. I add the water to the pot, put it on the stovetop and turn the temperature to exactly 100 degrees. ...
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Factors affecting Refractive index

I have a doubt that with increase in temperature the refractive index is decreasing but refractive index of ice is lower than water????
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1 answer
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Is there any relation between condensation and light?

Ok, I realise the question title is kind of stupid. But I don't really know how to summarize it in one line as it's quite a weird, specific situation. I have a lamp beside my bed on a shelf where I ...
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Why does water boil when vapour pressure is equivalent to atmospheric pressure?

I'm struggling to understand why water would suddenly evaporate in a vacuum. Does the water already posses enough energy to boil when the ambient pressure is zero?
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Pressure of a vacuum left by melted ice

Let's assume we have a completely sealed uncompressible container filled with ice (without no air gap between the ice and the cap). At room temperature, when ice melts in water, as the density of ...
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