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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1answer
17 views

Water Droplet Size Explosion

How do I control the droplet size in a water balloon during a midair explosion? In other words: can the droplet size be influenced by the choice of explosive inside the water balloon?
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Exploding water balloon [closed]

Imagine a balloon at a height. The balloon is filled with water and in its middle there is an explosive charge. What is the force applied to the water? What is the approximate area covered by the ...
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58 views

Ball motion in water

I am analyzing a video of a ball falling in water with tracker. The ball falls in a free fall for few seconds before it reaches a glass of water. The ball goes down till 3/4 of the glass, then stops ...
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For a given volume of air and water, which would heat up faster?

Based on a discussion I had with a friend over dinner tonight - he thinks water will because of the high conductivity, and i think air will, because even though it has lower heat capacity, the same ...
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Why does frequency remain the same when waves travel from one medium to another? [duplicate]

I was reading about reflection and refraction on BBC Bitesize and I can't understand why frequency is a constant in the wave speed equation. I can't visualise the idea of it. I know that wave speed ...
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Calculating formula prep using thermodynamics [closed]

I suspect there is a very simple mathematical formula for preparing formula (forgive the pun) that simply mixes a combo of freshly boiled water and room-temp water. To be specific, if I need to ...
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Why is the ionic product of water $K_w$ the same in acid, water, and alkali? [migrated]

Seen on the web: The concentration of [H+] and [OH−] both vary based on the the composition (acid/alkaline) of the solution, but the remarkable thing is that their product does not. When [H+] goes ...
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Auto-ionization equilibrium of water shifted with acid-base addition?

Adding acids or bases to water, so that either pH or pOH decreases independently of the other, will that affect the auto-ionization of water? For example, pure water + auto-ionized state, with some ...
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How does even water rise along a glass plate?

So, I was studying about general properties of matter and topics like surface tension. I came across the phenomenon of water rising along a glass plate like in the picture. I looked for some ...
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Bubbles (water) are transparent, then how can they produce white light in mass amounts?

Bubbles (water) are usually translucent, and transparent too. In the field of optics, transparency (also called pellucidity or diaphaneity) is the physical property of allowing light to pass ...
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Water density as a function of temperature

I would like to know if there is an expression or a correlation to calculate water (not gas or steam) at different temperatures. If possible both nonlinear and linear temperature calculation. I only ...
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1answer
31 views

Does electromagnetic radiation cause auto-ionization of water?

The auto-ionization of water into $\text H^+$ and $\text{OH}^-$ is often described as occurring spontaneously, that at any given time a tiny portion of the water will be split into its cation and ...
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Why does warm water and cold water make different sounds?

Why is there a different sound when pouring water for it being warm or cold? Pouring cold water makes a higher pitch sound than warm water. The difference is clearly distinguishable. I was unable to ...
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Calculate Roughness of Water with Weather Data?

I'm trying to calculate the roughness (in regards to rowing/boating, so white capping waves would be very rough, while glass-like water would be no roughness) of a body of water given the weather data ...
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Dumping hot liquid water in sink [closed]

When I make pasta or potatoes, I dispose of the hot water (around 80-100°C) in a metal sink. Am I justified to first pour regular hot tap water on the sink to reduce the amount of steam generated, or ...
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Why is the ocean darker when it is windy?

There are a lot of questions and answers on this site about ocean color, but none of them addresses my question. I have found this too: https://science.nasa.gov/earth-science/oceanography/living-...
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Will a single atom of an element with greater atomic mass than the $\rm H_2O$ molecule sink in a cup of water?

Will a single atom of an element with greater atomic mass than the H2O molecule sink in a cup of water? A single atom or molecule of a substance is placed in a cup of water. Because of its specific ...
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Air bubble trapped inside water at the spout of water tap

Is there a name for this effect and how is it formed?
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How far can an x-ray travel through water?

I am studying x-ray's and how they interact with different mediums, but I am a bit confused on the distances an x-ray can travel through different mediums such as water. Let's take an x-ray with 3 ...
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How to calculate the pressure in a bag of water under an applied weight? [closed]

I'm sorry is this is a simple question i am not very versed in physics, i tried searching google for this answer but didn't really know what i was looking at when i searched. Here is my problem. I ...
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Effect of deep-sea pressures on whales vs humans — how do whales survive?

I believe that humans would be crushed by the ocean at depths that whales regularly dive to. I know that the pressure per square inch is very high but whales can survive, I read, because of various ...
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2answers
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Why do speed boats leave narrow channels in their wakes?

I've noticed that when a speed boat goes over very flat water that a channel is left behind that doesn't spread. I've seen this on rivers. I would have thought that the small waves and ripples would ...
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Calculating wave strength and frequency from $x$ and $y$ rotation of an object floating on the surface of sea water

I am new here and I'm not a physicist but I have a question about how to find wave strength and frequency by using x and y rotation values of an object floating on water. Basically an object which I ...
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Why is it that lampblack repels water but graphite doesn't?

I have been playing around with lampblack recently, and one property that I particularly like in them is their Hydrophobicity. It's interesting to watch water drops just bouncing off the surface. I ...
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105 views

Salt water and ice, vs. plain water and ice

A famous puzzle is whether an ice cube melts to nothing more quickly in salt water or fresh water. The answer is fresh water, because the water melting off the ice cube sinks in the plain water and ...
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Can you fall, through air bubbles, in water

A year ago, we were swimming in the sea and there were divers below us. It was quite fun to look at the very large bubbles of air coming up around us. Then, a question popped up: assuming a stream ...
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1answer
89 views

Why did my coffee get heavier?

So I have just made my girlfriend a cup of coffee, for the first time using her method. Ignore how correct the method is, but I figure it is important to mention: Step 1: 37g* of coffee beans are ...
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4answers
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Why is the bottom of the Mariana Trench not frozen?

I have found following information on Wikipedia: The temperature is $1$ to $4\,°\mathrm C$ and the pressure is about $0.156$ GPa. The Graph tells us that it's liquid. However, I don't quite ...
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Why and How does different depths of water affect the wavelength of a wave on such medium?

When a water wave passes through from a deep water to shallow water , refraction is said to occur due to it's decrease in wavelength and thus decrease in speed , based on the formula v=fλ. Question is ...
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How to picture vibrational overtones of water?

Im trying to understand the colour of water. The absorption occurs because of some of the vibrational overtones of water. The absorption band at 698 nm (14300 cm−1) is a 3rd overtone (n=4) The ...
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Calculation of time for submerged container to fill

I have been thinking on a proper way to calculate time taken to fully flooded a closed compartment with seawater once submerged. Only one small hole opening available for water to come in and air to ...
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The Effect of Dissolved Substance to Water Density Anomaly

I've read this post Density of Solid State Compounds. As we all know, dissolved substance change water freezing and boiling points. My question is, how a dissolved substance affect the density anomaly?...
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Can I have one single molecule of water?

Is it possible detach one single molecule of water into vacuum lab?
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What happens when you put (pour) water on water with the same density? (Archimedes)

Suppose you have a glass of water, and you pour on it a volume V of water of the same density; if we consider the archimedes principle, what happens to the water that is poured? Does it float, sink, ...
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Can a submerged object in a free falling fluid sink faster than falling?

I've been wondering about how sunken objects would behave if you could instantaneously flip their container with water. Like if you had a bucket filled with normal tap water and you dropped a ball in ...
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2answers
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Why does water falling slowly from a tap bend inwards?

This is something anyone could easily verify. When we open a tap slowly, water bends inwards (towards the axis) while maintaining its laminar flow. After a certain height below the opening, the flow ...
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21 views

reverse osmosis membrane

We are second year cram schoolers , we are currently working on a project tackling water desalination by reverse osmosis and are required to do an experience. During the process, we encountered some ...
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Can electricity flow up down-flowing water?

I would imagine there are various things at play such as gravity, trepidation of the water (if any), strength of the electric current, and speed of the flowing water. For example, if a pool of water ...
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How is water athermanous?

My textbook says that water is an athermanous substance i.e. the type of substance which does not transmit any incident heat radiations. But how is that true since water is transparent, light that is ...
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Are water waves a kind of pressure waves?

According to wikipedia, the restoring force of water waves are gravity or surface tension, depending on the wave length and water depth. I can't understand exactly the gravity explanation. If ...
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31 views

Why surface tension occurs [duplicate]

I have this confusion of surface tension, in my books it is written that surface tension occurs due to cohesive forces acting on the particles which makes them to contract. (If this is the case then ...
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How come the same thing makes the situation either stickier or more slippery?

When I ride my motorcycle in the rain I feel the roads of London (UK) more slippery and I noticed I take longer to break and stop When the temperature goes below 1 degree celsius on the edge of the ...
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Calculate the rate of cooling of huge amount of water to room temperature

Is it possible to calculate the rate of cooling of huge amount of water to room temperature given the following parameters: The surface of water in contact with air the surface of water in contact ...
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1answer
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Why can water wicks act like siphons?

Take two empty cups (cup A and cup B) and fill cup A with water. Take a length of wet cloth and run it from the bottom of cup A to the bottom of cup B, while the cups are standing next to each other ...
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1answer
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Need to maintain constant water pressure from source [closed]

Was trying to setup a drip water irrigation .The initial setup was as follows - 1. Water tank tank at top of first floor 2. Siphoned a tube to backyard and provide water to plants The drawback here ...
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1answer
50 views

How can water be harder and less dense at the same time? [duplicate]

The Wikipedia says about water: Water also differs from most liquids in that it becomes less dense as it freezes. and The details of the exact chemical nature of liquid water are not well ...
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1answer
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What causes this phenomenon when boiling water?

A few days ago, when boiling potatoes I only cut each of them in half (leaving a flat face in each half). When the water started bubbling a little (and also later when it was boiling) the flat face of ...
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Water head and water velocity

Using Bernoulli's equation, it can be shown that the water velocity depends on the height of a tank relative to the end of a hose. In reality, I find a smaller hose produces a greater velocity on exit ...
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2answers
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What is water's center of mass?

Suppose there is a cube filled with water of height $h$. Where would the center of mass be? I would assume that since water is denser where it is deeper, the center of mass should move toward the ...
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Why can you find running water lower than $0^\circ \text{C}$?

I was looking at the phase diagram for water: It seems there is not much of a region on the diagram at which you can be in the liquid phase, for temperatures lower than $0^\circ \text{C}$. I am ...

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