All Questions
19 questions
3
votes
0
answers
182
views
Is there such thing as metallic helium?
I know that hydrogen can behave as a conductor under high pressure (metallic hydrogen); however could helium behave similarly under high pressure? If so, could this have any potential benefits over ...
user145192
2
votes
1
answer
344
views
Does the vapor pressure of a substance depend on the presence of other gases?
The Clausius-Clapeyron equation (CC equation) can be used to find the (saturated) vapor pressure of a substance ie. the gas pressure at which the two phases (vapor + liquid or vapor + solid) reach ...
- 29
1
vote
1
answer
205
views
What pressure does liquid nitrous oxide need at −45 °C?
What pressure does liquid nitrous oxide need at −45 °C to remain liquid? How can I calculate its pressure required for other temperatures?
- 121
13
votes
4
answers
23k
views
At what pressure will hydrogen start to liquefy at room temperature?
I want to increase a fixed-size object's internal gas pressure by generating hydrogen in it, but I could not find the proper phase diagram for it. So I am wondering how high pressures I can get.
- 149
3
votes
1
answer
2k
views
Can silicon dioxide melt at 20 °C?
Can $\ce{SiO2}$ melt at $\pu{20 ^\circ C}$?
I have searched the web for $\ce{SiO2}$ phase diagram, but it seems to me that almost all the graph I can find have the temperature axis where the minimum ...
1
vote
1
answer
2k
views
Clausius–Clapeyron equation: shape of phase diagrams makes no sense
I am trying to model the melting point of a substance at varying pressures (ranging from very small to very very large). All I am trying to do is make an equation that relates melting temperature to ...
4
votes
1
answer
802
views
Vapor pressure vs. ambient pressure
I've managed to get myself thoroughly confused in thinking about the vapor pressure of a substance at a particular temperature $T$, and how it relates to the pressure of the substance if it is in a ...
- 1,289
1
vote
0
answers
103
views
What causes both components of a binary gas mix to condensate at the same time for a given composition
Okay, so recently I encountered the temperature - mole fraction diagrams for binary vapour-liquid equilibrium. For now, I only consider two-component systems where the components are very similar and ...
- 71
0
votes
0
answers
171
views
Can every liquid pure substance be compressed to solid?
Apart form the fact that liquid are often misleadingly considered incompressible,
fact that I recently find out to be true only as an approximation in specific circumstances.
I was curious to know if ...
1
vote
1
answer
13k
views
Can a liquid turn to a solid by applying pressure?
When pressure increases, volume decreases. If an extremely high pressure is applied to a liquid, is it possible to reduce it's volume to an extent where the molecules are very tight together, hence ...
- 111
15
votes
2
answers
334
views
Does exotic potassium exist?
I was reading a book called 'Hundred and Seven Stories of Chemistry'.
There is a chapter about how the attributes of different elements can change in presence of enormous pressure and temperature. ...
- 2,331
1
vote
1
answer
436
views
What is pure oxygen (gas) density as a function of T or P?
I'm looking for a set of data (ideally graphed) of $\ce{O2}$ density as a function of $T$ or $p$ (with constant $p$ or $T$, respectively).
The best I've found is this 1948 paper which provides an ...
- 3,620
6
votes
3
answers
3k
views
Will supercritical nitrogen stay supercritical if we raise temperature and pressure high above critical values?
Nitrogen's critical temperature is -146.96 °C and critical pressure 33.96 bar. If we maintain nitrogen at 220 bar and 400 °C, what will be the state of $\ce{N2}$? Will it be still supercritical? I ...
- 79
0
votes
1
answer
161
views
Vacuum at different altitude
I have tried to find this searching the internet and I am not sure if I understand it. I want to turn water from solid to gas without going into the liquid phase - Sublimation.
The altitude above sea ...
- 1
3
votes
2
answers
3k
views
How much pressure does Gallium exert when it freezes?
Assuming the liquid Gallium is in a sealed container, how much pressure will it exert on its container when it freezes?
- 39
0
votes
1
answer
453
views
Pressure increase on rate of reaction
For reactions involving gases, an increase in pressure is no different from increasing the concentration of reactant particles, thus increasing the rate of reaction. But for reactions involves ...
- 19
8
votes
4
answers
2k
views
How does iceskating work?
I was willing to understand a little bit better the physics behind iceskating.
Messy thoughts
From New Scientist (1964) (probably not the most up-to-date reference $\ddot \smile$), I found a diagram ...
- 251
16
votes
4
answers
4k
views
Room-conditions supercritical fluids?
Are there any reasonably obtainable supercritical fluids that I could, say, run my hand through? Wikipedia makes it sound like there are plenty of room-temperature ones, but no room-pressure fluids.
- 283
0
votes
0
answers
166
views
Ice under very high pressure phase transitions [duplicate]
If you put a piece of ice into a very high pressure chamber and increase the pressure, I can understand how the ice turns to a water state. But what happens after that? Does the pressure push the ...
