Questions tagged [ice]

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1answer
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Melting ice: reversible or irreversible?

I am looking into whether the melting of ice (or any substance for that matter) at constant pressure and temperature is reversible or irreversible. Different sources say different things, and it may ...
3
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3answers
44 views

If liquid water is constrained in vessel then the temperature is dropped below freezing will ice form?

If liquid water is constrained in vessel then the temperature is dropped below freezing what pressure would be measured assuming the vessel is unbreakable? Or put another way, will ice form if the ...
3
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2answers
65 views

Does salt water melt faster or slower than pure water?

I am trying to conduct an experiment on the melt time time of two ice cubes with a different salt concentration, one with none and one with a lot. Does salt water melt faster than pure tap water? (...
3
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0answers
340 views

can freezing water burst a short pipe if the pipe is open at both ends?

My question: If a thin-walled copper or brass pipe is open on both ends (let's dimension it at 60 cm long by 8mm inner diameter, as an example) and is filled with slightly salty water (estuarine ...
2
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1answer
110 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 ...
2
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0answers
43 views

Ice formation in a cavity that was sealed at ambient condition and taken to space

I have a hardware with a cavity that was closed (welded) at ambient conditions (298K, 1 bar Pressure and 50% RH). The hardware was taken to space where the temperature can go down to near zero Kelvin. ...
2
votes
1answer
121 views

How does the water anomaly affect the Mpemba effect?

I understand basic explanation of Mpemba effect like this: Distant molecules are easier to realign into new formations. But if we compared two bottles of water like in Mpemba effect and one of them ...
1
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0answers
25 views

Crystals, symmetries in mixture

What would happen to the crystal structure of ice, if i freeze salt water? What changes in symmetry can i expect? I do not know the terminology for this stuff...but in what 'subclass' or 'subfamily', ...
1
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0answers
86 views

Pauling's derivation of the residual entropy of ice

I am trying to understand Pauling's derivation of the residual entropy of ice (link). First let me paraphrase Pauling's argument. He supposes that every oxygen atom (let's call one of them $A$) is "...
1
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1answer
28 views

Why does water freeze radial around an object?

I noticed an interesting fact today while having a popsicle during my lunch break. When I bit the top of, I could see that in the freezer the ice had frozen radial around the stick. Could anybody ...
1
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0answers
373 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 ...
1
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0answers
534 views

Volume expansion coefficient for freezing

It is a well known fact that water expands when it freezes, and here's one of the explanations I found on Physics SE: Why water expands when freezes? "The expansion upon freezing comes from the fact ...
1
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0answers
75 views

How much energy is released by decompressing water?

How much energy would be released if 2L of (relatively pure) water compressed to 1L at room temperature was suddenly decompressed to atmospheric pressure? Even a first-order approximation would be ...
1
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0answers
24 views

Fermi estimate for ice nucleation timescale

My friends in a Cryo-EM lab freeze their very samples quickly, a process they call vitrification. The timescale for this process is milliseconds (from wikipedia): The production of amorphous ice ...
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0answers
11 views

How can a large ice stupa melt in an extremely short amount of time?

I was slightly motivated by a related question on stack exchange, why does an ice stupa not melt for 6 months? I am asking the converse here, what shape will make a 2000 ton heavy stupa made of ice at ...
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0answers
26 views

Why are the six prongs of a snowflake the same?

My understanding is that the variety in snowflakes is determined by pressure, temperature, and humidity. This is why the six prongs grow same way, because they are close enough that they are in the ...
0
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1answer
25 views

How to avoid confusion of when to use and not to use the heat of fusion and condensation to get the amount of water in temperature equilibrium?

I'm not very sure of when should be used the heat of fusion and the heat of condensation for water. This happened when I attempted to solve a problem of this matter. The problem is as follows: A ...
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0answers
9 views

What is relation between Absolute humidity and frost formation?

We see frost formation on our car glass when ambient temperature is really low. I believe this frost formation comes from water vapour from the air. So should there be more frost formation with ...
0
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0answers
73 views

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 ...
0
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0answers
35 views

How can I get the height that sits above the waterline of a partly-submerged object?

If I know the density of water (say 1024 kg/m^3) and the density of ice (say 900 kg/m^3), and the volume of an object (say 8 x 10^9 m^3), how can I figure out how much of it is sitting above or below ...
0
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1answer
34 views

Wind erosion of Ice

I saw this video on Youtube https://www.youtube.com/watch?v=Hs5iXGJVkb8, but I really don't how answer this question: How is it possible that wind can cause ablation of ice? I know that ice can ablate ...
0
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0answers
65 views

Water solidifies near the bottom of a hypothetically deep oceanic trench

How deep (kilometers) would an oceanic trench on planet Earth have to be in order for the water to become a solid because of the pressure from the water column? For simplicity, maybe assume chemically ...
0
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1answer
102 views

can ice crystals be molded into a structural shape in space

I know that water exposed to vacuum space first boils and then turn into vapor (sublimates) . Is it possible re use this vapor say inside a pressurized membrane, to mold it into a solid ice structure, ...
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0answers
84 views

Melting icicles

If I break off the bottom half of an icicle, will the top half melt faster?                       &...
0
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1answer
817 views

Fastest way to melt ice cubes in glass of water

I'm in a restaurant and order a glass of water. What I get is about 50% water 50% ice cubes. So, after finishing my water, I'm left with half a glass of ice cubes. I'm in a hurry, so need to leave as ...