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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Difficulties understanding fluid flow claims in the context of animal physiology/cardiovascular networks

A topic that has repeatedly given me confusion is the notion of fluid flow through animal vasculature. I find that many of the 'physics 101' basic notions of fluid dynamics are not well-suited to deal ...
S.C.'s user avatar
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4 answers
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General Doubt. My doubt about combustion

When we give flame to a newspaper it burns readily. What we need for a fire (fuel, heat, Oxygen) is also known as the fire triangle. But why does the paper not burn when we pour boiling water over it? ...
Gautam's user avatar
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Keeping sparkling water inside a bottle as aerated as it was before opening bottle

So when you open a new bottle of sparkling water (or soda) it's very fizzy and aerated. However, when it is stored for quite a bit (no matter how tightly you close the bottle cap) it loses some gases ...
bonbon's user avatar
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Apparent position of object in bowl of water

Say you have a bowl of water and you keep an object in it. What would the apparent position of an object inside the bowl from the position of an outside observer? Will the curvature of the spherical ...
Astrovis's user avatar
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3 votes
1 answer
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Does having a liquid (less dense than ice) above a floating (in water) ice cube, change the fact that the water level remains constant when ice melts?

An ice cube floats in water, with a liquid (less dense than ice) above it. When the ice cube melts will the water level go up, down or remain constant?
WilliamHarvey's user avatar
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How long to put Silica gel in microwave oven?

I have a 800 W microwave oven and want to dry some silica gel packages (each labeled with 10 g and sealed in paper mantling). The silica gel is colorless and seems to be of the kind of silica gels ...
user7468395's user avatar
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Does the specific heat of water vary with pressure?

I know that there is both a Cp and Cv value, but here's what I don't understand: are they independent of what the absolute pressure is? They vary with temperature, and tables can be readily found with ...
Michael's user avatar
1 vote
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Best mesh design for a tea strainer [closed]

I'm currently designing a closed tea strainer / egg made of stainless steel and testing a prototype made of polycarbonate plastic. The problem I'm facing likely has to do with the capillary effect - ...
Andrew Jackson's user avatar
2 votes
2 answers
58 views

Can latent heat exist when both phases cannot exist at same temperature?

This is my understanding (please tell me if i am going wrong anywhere): During phase change (i.e. ice melting into water) the molecules absorb heat, gain more random kinetic energy, and spread apart (...
Varshil MVH Pets's user avatar
2 votes
2 answers
70 views

For a liquid at boiling point, how can it require a set amount of heat (latent heat) to vaporize

I've always had a hard time wrapping my head around the 2 below statements being true for vaporizing a liquid into a gas: When a liquid reaches its boiling point the temperature stops rising (and any ...
LWilkinson's user avatar
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1 answer
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Peltier Thermoelectric Module - Water Cooling

My questions concerns calculations about a Peltier Thermoelectric Module for the cooling of water between an inlet and outlet. The Peltier water cooling module I am referring to is the following: ...
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Why does laser light not bend (refract) when it travels from air to water?

I passed green laser light from air to water but to my suprise the light doesn't bend towards normal even though I changed the angle of incidence.It goes undeflected ,Is it because of its higher ...
Sanjay S's user avatar
1 vote
1 answer
27 views

Why does the freezing point of water regress at select pressures before increasing again at even higher pressures?

This phase diagram of water shows how the phase of water is determined by the pressure and temperature. I find it easy enough to understand; as the pressure increases, the boiling point of water also ...
user267545's user avatar
1 vote
0 answers
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Capillary action strength questions [closed]

I've been studying capillary action, and I've drawn some conclusions about the behavior which surprised me, and I want to know if I'm understanding it correctly. According to Jurin's law, the height ...
David Davidson's user avatar
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142 views

Conservation of water?

I know that water can exist in various states (liquid, solid, ...) and can be in various places (clouds, oceans, ground, ...). What I want to know is whether or not the total number of water ...
Will Octagon Gibson's user avatar
3 votes
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Why do water surfaces have persistent "average wavelength" patches?

Have you ever stood above a river or lake and noticed that the surface has visible "patches"? It looks like the surface has different average wavelengths in some areas, leading to the light ...
Robert Wegner's user avatar
2 votes
1 answer
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Hysteresis in volume of liquids and solids vs temperature

We were asked as a lab experiment to measure the volume occupied by water and ethyleneglicol as a function of its temperature by having a flask inside a body of water at the desired temperature. Then, ...
Jaime Yepes de Paz's user avatar
2 votes
1 answer
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Do high powered lasers refract differently than other light?

So I have a question: I am told that there are naval lasers that target over 100's of miles ship-to-ship (not ship to air). Someone asserted that powerful lasers would refract differently than light. ...
Marco Chacon's user avatar
3 votes
2 answers
127 views

Why does water warm gradually when a faucet is opened?

When you turn on a hot water tap after some idle period, you first get the cooler water that's been in the pipe, then gradually it warms up to the tank temperature. I've wondered why the warmup is ...
Jim Mack's user avatar
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2 votes
2 answers
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Would seawater flow be affected by a magnet?

Let's suppose that there are two streams of sea water, flowing on a flat inclined surface. Both of the streams are distant, independent of each other and parallel to each other. Now lets image I put a ...
Dario Deniz Ergün's user avatar
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2 answers
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Why does curvature reduce the inward attractive force of molecules?

This question concerns the first 2 paragraphs of this text. I am struggling to visualize why molecules on the flat surface experience more net inward force than those on a curved surface. If we have 2 ...
Michael Munta's user avatar
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Converting starting wave to known max wave height

in our university project, we are developing a tsunami simulation using the Shallow Water Equations. For our project, we have decided to allow users to enter an epicentre and the magnitude of an ...
TheBest_Kappa's user avatar
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Measuring Temperature of Water-filled Methacrylate Capsule: Laser Thermometer Accuracy and Penetration Depth Inquiry

Imagine that I have a methacrylate capsule filled with water (8cm in diameter and 30cm in length). If I wanted to measure the temperature with a laser thermometer pointing at the capsule, what ...
Eladio's user avatar
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1 vote
2 answers
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Effect of impurities on boiling and freezing points

When impurities like salt is added to water, the boiling point of water increases because of what I think is vapour pressure, though I know very little about that too. However, with the same analogy, ...
Ayush Singh's user avatar
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1 answer
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What's the fastest speed water from a glacial dam burst could achieve? [duplicate]

I've been watching a lot of Graham Hancock videos of late, thrusting myself deep into the rabbit hole of pseudoarchaeology/alternative archaeology, and I don't really know enough to assess the ...
Josh Hills's user avatar
12 votes
3 answers
3k views

Can water at absolute zero still be liquid?

We see this interesting phenomenon with water bottles in cold chillers left undisturbed for a long time; the water within remains a liquid, but a small kinetic shock, such as a tap, shake or pour, ...
ConnieMnemonic's user avatar
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Does air gap between enclosed chamber and manometer influence the manometer reading?

We have an enclosed chamber filled with water. From the top of the chamber there is a metallic tube connecting the chamber to a monometer. We increase the pressure of the water inside the chamber buy ...
Mikael Arian's user avatar
-3 votes
1 answer
223 views

Why isn’t $\rm H_2 O$ a primordial element? [closed]

We’re told the universe was very hot and energetic immediately after the Big Bang, and just shows H2O was present early on. Yet, it is not considered to be a primordial element. Why is that?, and what ...
Patrick Payne's user avatar
12 votes
9 answers
5k views

Could one perform a test to determine whether water was warmed by a microwave rather than over a flame?

If I warmed two cups of water from 20 °C to 90 °C, one in a microwave and one over a flame. Is there a test that could be performed to determine how each cup was warmed? Are there residual effects ...
Joe's user avatar
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Any method for measuring hydroxyl and hydroperoxyl radicals in water?

I am looking to irradiate water containing some amounts of iron and would like to measure the amount of hydroperoxyl and hydroxyl radicals produced in real time as a result of the irradiation. Is ...
Bon's user avatar
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3 votes
2 answers
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Enthalpy of formation function of temperature

Why is the enthalpy of formation a function of the temperature? We can see in the dedicated tables (such as JANAF), that the enthalpy of formation changes with temperature. Doesn't the enthalpy of ...
AeroThermo's user avatar
1 vote
2 answers
191 views

Why do hot water droplets persist in cooler water?

I notice this phenomenon typically when mixing hot or warm water with cold water. Basically, tiny droplets of hot water travel inside the body of cooler water and persist. I have included a photo of ...
hedgepig's user avatar
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Formation of wave ripple fields (in sand)

I've read a few articles about wave ripple fields: https://www.coastalwiki.org/wiki/Wave_ripple_formation https://en.wikipedia.org/wiki/Wave-formed_ripple and a few others. However, those two ...
Mah Neh's user avatar
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10 votes
2 answers
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Could a fish swim out of a sphere of water in a zero-gravity environment?

Can a fish swim out of a sphere of water in a zero-gravity environment? I am going to state some assumptions. We assume the sphere of water is not affected by any thermal properties of its zero-...
Jonathan L.'s user avatar
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1 answer
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Melting of 2 circular ponds after winter

Two circular ponds of equal depth have various diameter. Both ponds are situated not far from each other and are subject to the same winter conditions. When the spring comes, the ice cap starts ...
Jimmy Bionic's user avatar
8 votes
4 answers
5k views

Since water is a molecule, can the aerosol sprayed through double slit form interference pattern?

A water molecule is made of 1 oxygen atom and 2 hydrogen atoms, so it is very small, like quantum scale small. So if I accelerate a bunch of these water molecules through the double slit using a spray ...
user6760's user avatar
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1 answer
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Difference between Kopp-Neumann and Dulong-Petit law?

So this is basically a follow-up to this question: How many degrees of freedom does the water molecule have? I've done some further research and found that the main difference between Dulong-Petit and ...
Zedssad's user avatar
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How many degrees of freedom does the water molecule have? [duplicate]

This is mainly a question about molar heat capacity. I've read many different values for the degrees of freedom of water, for example f = 12 on (https://en.wikipedia.org/wiki/Molar_heat_capacity). But ...
Zedssad's user avatar
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7 votes
3 answers
3k views

Why does more ice melt slower than less ice?

I know that ice cubes that are larger melt slower because of their surface area. However, when you put more ice cubes in a cup, all the cubes melt slower than a cup with less cubes. I hope this makes ...
user386598's user avatar
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Shape of a static capillary surface

I am studying the effects of surface tension and in particular the shape of a capillary interface in hydrostatic condition. Let's recall the Young-Laplace Equation $ \Delta P = \sigma \bigg(\frac{1}{...
leo95nf's user avatar
4 votes
1 answer
156 views

Number of fog droplets in the air

I have an issue with the official solution to this problem from BelPhO: Visibility on the road is 100 m. Assuming that the diameter of a fog droplet is 1 micron, estimate the concentration of fog ...
Bml's user avatar
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1 vote
0 answers
54 views

Why there is water produced on the phone if we keep our phone in our pocket for a longer time?

one day I kept my phone in my pant pocket, I haven't opened it for a long time. My phone is covered with a plastic case. So why the phone is getting wet when I observed it after some time even though ...
sudarsan's user avatar
1 vote
1 answer
60 views

Water Vapour and Liquid Water Interactions

It is known that a certain number of particles in a sample of water have enough kinetic energy to ‘escape’ from their intermolecular bonds and into the gas phase. But what is stopping these water ...
Mason Shah's user avatar
1 vote
1 answer
48 views

Is it possible to use a water molecule's expansion/contraction effect with heat as a motor?

When water molecule is cooled, it is well known that it expands: That's the reason the rocks in the desert explode in the cold of the night: the rocks have water inside that expands with cold and ...
arod's user avatar
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Is the strongest acoustic signal always the closest?

I have a single beam echosounder that I use to measure the distance to an object underwater. It emits an acoustic pulse and listens to the reflections. Using the time of flight and the strongest ...
Apo's user avatar
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1 vote
2 answers
3k views

Why does boiling water in the cold instantly evaporate if it is splashed out of a mug?

If I pour boiling water into a mug and throw it out from the balcony in very cold weather (-20 degrees Celsius and below), then it instantly turns into a cloud of steam, even before it reaches the ...
Robotex's user avatar
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1 vote
1 answer
138 views

Is water capacity of air affected by air pressure?

Air can hold water in proportion to partial pressure of water vapor. This is affected by temperature. But is the water capacity of air also affected by ambient pressure? I did find some answers that ...
Foxtrot's user avatar
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0 answers
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How to find the rate at which water can pass through a semipermeable membrane that allows particles of size lesser than 0.5 mm?

I was wondering what would be the rate at which water would cross a semipermeable membrane that allows particles of size greater than 0.5 mm. Knowing that size of water molecules is 2.75 angstroms ...
harshmangalamv's user avatar
1 vote
0 answers
65 views

Melting point of water [duplicate]

Wikipedia says about melting point that: The melting point of ice at 1 atmosphere of pressure is very close to 0 °C (32 °F; 273 K); this is also known as the ice point. But why it is very close and ...
Harjot Dhillon's user avatar
0 votes
1 answer
97 views

The solubility of gases in liquids. Laws and equation [closed]

I am studying the solubility of gases in liquids (flowing then into the study of oscillations of gas bubbles out of the liquid phase). The task at the moment is to familiarize myself with the laws of ...
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