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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84 views

Why do we heat salt water to desalinate it rather than freeze it?

Most sea water desalination plants rely on the basic principle of heating water to evaporate it, after which the salt-free vapor is condensed. According to Wikipedia, over half the cost of ...
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Risk of megaton steam explosion from Chernobyl? [duplicate]

In the new Chernobyl TV series (https://en.wikipedia.org/wiki/Chernobyl_(miniseries)), in episode 2, there's a reference to the risk of a steam explosion from the molten reactor core entering a water ...
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Will we be able to experience huge waves one after the other if we were near a strong gravitational field?

I was wondering if we will have huge waves due to the presence of a strong gravitational field nearby earth? If our planet is rotating around the gravitational field, is there a possibility for ...
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Grooves on water tank

Why are there grooves on almost every water tank? Just typing water tank in Google images would reveal what I am talking about. And here is a sample picture! I think it would mostly be regarding ...
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Minimal work required to produce ice at room temperature

I'm wondering about the most efficient way of producing ice from water at room temperature. First of all: why, in principle, do we need to put in work to do so, if water gives off energy while ...
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Water thru a small hole

If I were to fill a 700c 25mm road bike tire with some water and pump the tire to, say 100psi, and punch a tiny hole in the tire, the water will start to spray out. My question is: does the water ...
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Styrofoam planted in iron, can it float

Imagine a cube Styrofoam box planted in an iron box with the same size, if we put it on the water Can it float?
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Hydrostatic pressure to measure water level

I am measuring water level in a 25-inch tall vase using hydrostatic pressure. Like this. To do this I have a 1/4 OD inch nylon tube connected to a gauge pressure transducer. So far it has been very ...
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Hot Tub Heating - Element Size

Is it more cost effective to heat a hot tub with a smaller heater, say 1.5kw, than it is to heat it with a 3kw heater or even a 6kw heater? Obviously the larger heaters will heat the water faster - I ...
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Real world applications of triple point?

What are the real world applications of triple of water? And is it worth researching what factors could effect it?
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Will tsunami waves travel forever if there was no land?

If there was no land for tsunami waves to collide with, can the waves travel around the globe for forever?
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Does tea made with boiling water cool faster than tea made with boiled (but still hot) water?

I always make tea with boiling water - not water that is almost boiling, not water that has boiled and stopped boiling a few seconds earlier - in my opinion, for the best tea flavour the water must be ...
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What would happen to the water bodies if gravity ceased to exist on Earth?

If water stopped flowing (it would stop flowing downwards from mountains and all) then, would it start rising upwards? If it floats on the space ( I say space because there'd not be any atmosphere) ...
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Sensitivity of latent heat of fusion of ice on temperature and pressure

The enthalpy of fusion is the heat necessary to convert 1 kg of ice to liquid water. According to Wikipedia, this heat equals 333,55 kJ/kg. Does this heat change with the temperature or pressure and ...
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How many calories of energy does it take to heat up 1 cubic inch of water 1 degree Fahrenheit? [closed]

In metric, one milliliter of water occupies one cubic centimeter, weighs one gram, and requires one calorie of energy to heat up by one degree centigrade--which is 1 percent of the difference between ...
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Is there any force that affect to wearable accelerometer underwater?

I am trying to find displacement of underwater sport player with my accelerometer sensor. My question is; is there any force that affect to an object that weared by a human underwater? Thanks.
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Can water be made more violet?

Water is intrinsically blue because of molecular vibrations. The topic is covered here: Only sea water appears blue in color, why this is not happening in river water? And here, which I post ...
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Moonlight reflection on ocean [duplicate]

I am trying to explain physically what is happening in the picture below: My gut explanation is that we are observing the reflection of a cone of light emanating from the moon, it explains the form ...
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Density of ice < water?

In the situation of an ice cube placed in water and eventually melting, it is supposed that natural convection is the process in which heat transfer from water to ice occurs. However, natural ...
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How does ice melt when immersed in water?

When an ice cube is immersed in water at a room temperature, how is the thermal energy from the water transferred to the ice cube? Currently I have two answers: Infrared radiation from the water ...
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Velocity of a leak in a cylindrical water tank that spins with constant angular velocity

We have a cylindrical water tank that spins over its axis of symmetry. Here's a diagram: The objective is to find: $1$ - The tangential and radial components of the velocity of the water as it ...
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Does light only mimic water waves, or also the properties of water?

Huygen's Principle compares diffraction to ripples in water. Do the similarities translate to surface tension? The hydrophobic effect?
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Is there any reason to remove the air from a bottle of water before you freeze it?

When you put a sealed bottle of water in the freezer it explodes, (I get this part). I was told that filling it with 100% water (removing the air) first stops the bottle from exploding as this allows ...
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Does soap repel water?

Yesterday when I was taking my bath, I scratched my soap bar a bit and threw that bit on the shower floor. There was a little amount of water on the floor where that soap bit fell. To my surprise, I ...
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How does waterfall produces negative ions? Do rain do too?

I read that water molecule steal electron from oxygen molecule but the next sentences onward is talking about the benefit of negative ions for health, what is the cause of negative ion production in ...
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How long would it take for a cup of water to fully evaporate?

How long does it take for a cup of water to evaporate? To answer this question, I'll assume some basic parameters, and that the water is blown on by a fan, to arrive at an estimate: Water volume: $...
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Why microwave oven makes dried bread soft?

This is an old age trick: if you have some bread that became dried and you put it in the microwave few tens of seconds (10 to 30 for top results) you get a nice soft and warm loaf as if it just came ...
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Measure static pressure with measuring tubes of different diameter

Assume you have a horizontally placed cylindrical pipe with constant diameter. There is a flow of water, through this pipe. You want to measure the static pressure inside the tube, which should be the ...
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Water and Resonance

I want to confirm this, I’m not 100% sure on the subject and I’ve done a lot of research into this. Does water not only take the shape of the vessel it’s in but also the frequency and or resonance. ...
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Phase change in oceans

When ice cube melts in water the level of water doesn't change but when glaciers melts in oceans sea water level increases why?
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Do quantum effects play a role in the evaporation of water?

Imagine a thermodynamic system composed of a tumbler half-full of pure water, composed entirely of 1H and 16O. The system is isolated from extraneous influences by a perfect box impermeable to ...
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The maximum velocity of an object in water [closed]

Suppose we have the mass and volume of an object, like a sphere, with density less than water. We grab it under the water and leave it, so it will fly up to the surface. What will be the maximum ...
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Maximum density of water

The maximum density of water in its liquid form occurs at around 4°C (under normal pressure p = 1013,25 hPa). If the pressure is increased (or decreased) would the point of maximum density still be at ...
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Converting normal water into magnetic water [closed]

When I magnetize water by circular magnets of strength 0.8 T, how long will the magnetism be present in the water? I mean, how many days will it be in the water?
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Why sand in a water collects at center on rotating the water? [duplicate]

We commonly observe that on rotating dirty water, the dirt in water collects at the center. But why does it happens, and why does it not collect at edges due to centrifugal force. Does something ...
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Microwaves in other media

I saw a video on how microwaving grapes make plasma. He said that the refractive index of microwave is about 10 inside the grape. Now, we don't know the wavelength of the microwaves in the grape or ...
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Temperature change of water

Question: If... I have to identical vessels containing an equal volume of water. I place them in a room with an ambient temperature of 20 C, at normal pressure, in a normal atmosphere. I heat one ...
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Is light penetration through water affected by water pressure?

Does water pressure affect propagation of light through water?
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Is the triple point of water exactly 0.01 $\deg$C?

Is the triple point of water exactly $0.01 \deg$C, or is this an empirical value/is there some uncertainty to it? If so, how do we know it is exact, and why?
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What is role of nucleation centre in the formation of ice?

Water must be impure so that the impurities can act as nucleation centre for ice to form. What is role of nucleation centre? Why can not ice form with some nucleation centre? About existing (and ...
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Temperature of items from a freezer [duplicate]

I've read that all items in a freezer are at the temperature at which the freezer are set to (obviously items have to be in the freezer long enough). So, if I put normal tap water in a freezer which ...
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111 views

Which one is better to boil water, using high heat or less heat?

Consider that I have a water boiling kettle as below. Assume that it is made of metal, not plastic (but plastic probably also will do). Assuming I can adjust the power it uses to boil the water with ...
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Why does sound behave differently in water than in air?

I noticed in some experiments at home that sound does not behave the same in water than in air. Is there a good scientific explanation to this? I noticed that the sound sounded distorted in water but ...
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Why is water attracted by static electricity and not repelled? [duplicate]

As most of you will certainly know, when a statically charged object is put close to a stream of water, the stream of water bends towards the charged object. Gathering information online, it seems ...
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Why do ice crystals form from the top to the bottom of a bottle filled with supercooled water?

If I bang a bottle filled with supercooled water against a hard surface, the ice crystals form from the top to the bottom:$\hspace{50px}$$\hspace{75px}$–source. YouTube has videos showing this ...
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Is it possible to drain all oceans' water to space? [duplicate]

Assuming: That I have an ideal straw (a very long pipe) from the ocean to space; That the straw (pipe) is ideal (will not break); That i can pump all the air from the pipe creating vacuum inside the ...
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51 views

Sound emitted by droplets hitting a liquid surface

when a liquid jet (e.g. water) hits a water surface sound may be produced if, due to Plateau Rayleigh instability, the water jet has formed into droplets. But what exactly causes the sound? Is it the ...
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Is it possible to have a planet entirely made out of liquid water?

Earth is mostly covered in oceans, but they only go a few kilometres deep. It's obviously not possible to have a planet the size of the earth to be made entirely out of water, because of the kind of ...
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How can one the find normal force of a block resting on a pool floor underwater?

There is the force of gravity on the block, the atmosphere, the water pressure o top of the block, but how about between the block and the floor? Would we calculate water pressure pushing up from the ...
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Why does air get trapped below water pouring into a glass?

The drinking-water-tap at my workplace has a low pressure continuous stream of water. When I pour water into a glass which has at least about (depth) 5cm of water in it, surprisingly large air bubbles ...