Water world @ 450K?

soddish

S
Depends on surface pressure. If it's high enough to keep the water from evaporating at that temperature then why not?
 

GunnerBill

GunnerBill
Possible provided the atmospheric pressure is high enough to stop it boiling off???

soddish said:
Depends on surface pressure. If it's high enough to keep the water from evaporating at that temperature then why not?
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Lol beat me!

And of course the saltier the water the higher the BP.
 
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Sapyx

Sapyx
A "Water world" is a world which has liquid water on its surface. Liquid water cannot exist at temperatures above 647K, no matter what the pressure is. It also cannot exist at pressures above 218 atmospheres. At temperatures and pressures below this "critical point", liquid water can form. Above it, and what you have is neither liquid water not steam, but "supercritical water", which kind of has the properties of both a liquid and a gas. A planet with a supercritical water "atmosphere" would not qualify as a "water world"; it would be a high metal content world with a thick water atmosphere.

For water to not boil at 450 K, you need an atmospheric pressure of at least 10 atmospheres. So long as your planet has a surface pressure somewhere between 10 and 218 atmospheres, then it is complying with the currently-known laws of physics.
 

GunnerBill

GunnerBill
Sapyx said:
A "Water world" is a world which has liquid water on its surface. Liquid water cannot exist at temperatures above 647K, no matter what the pressure is. It also cannot exist at pressures above 218 atmospheres. At temperatures and pressures below this "critical point", liquid water can form. Above it, and what you have is neither liquid water not steam, but "supercritical water", which kind of has the properties of both a liquid and a gas. A planet with a supercritical water "atmosphere" would not qualify as a "water world"; it would be a high metal content world with a thick water atmosphere.

For water to not boil at 450 K, you need an atmospheric pressure of at least 10 atmospheres. So long as your planet has a surface pressure somewhere between 10 and 218 atmospheres, then it is complying with the currently-known laws of physics.
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I did wonder about those factors but phone kybd

Meh!

Thanks for detail :D
 

ArgusP

A
looking back it was only 405K, 6 atmos. Its' sun is acting up. Don't know if that system grid is meant to be to scale, otherwise I would think the atmosphere would be blown away
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Sorry, tried to embed a pic in the post but doesn't show. Solar flare shown extending beyond planet.
 
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soddish

S
The system map isn't to-scale, it'll show adjacent bodies in the same way whether they are 10Ls apart or 10,000Ls. The orbital radius is shown in the description of a given planet.
 

Sapyx

Sapyx
Yep. But that 860K planet posted by AnthorNet is indeed a violation of the laws of physics, if it has been reported to EDSM properly.

From which we can conclude that the physics simulation in ED is "pretty good", but not perfect; it tends to break down in extreme circumstances. Of course, all the atmosphere-less water-worlds and ammonia-worlds and the atmosphere-less "ice planets" at 1700K already testify that the in-game physics at extreme circumstances are not well modelled.

Of course, our current understanding of the laws of physics "breaks down under extreme circumstances" (ie inside or near a black hole) too, so who knows, maybe it's our laws of physics that are the real problem.
 

Eros

Eros
Sapyx said:
Yep. But that 860K planet posted by AnthorNet is indeed a violation of the laws of physics, if it has been reported to EDSM properly.

From which we can conclude that the physics simulation in ED is "pretty good", but not perfect; it tends to break down in extreme circumstances. Of course, all the atmosphere-less water-worlds and ammonia-worlds and the atmosphere-less "ice planets" at 1700K already testify that the in-game physics at extreme circumstances are not well modelled.

Of course, our current understanding of the laws of physics "breaks down under extreme circumstances" (ie inside or near a black hole) too, so who knows, maybe it's our laws of physics that are the real problem.
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Well the simulation is only as complete as your model, so it is entirely possible that the phase diagrams for various major chemicals do not cover a wide enough range correctly and so yes you get these edge cases.

That plot i posted doesn't go up to 860K, only goes up to 650, though, to have water on that world as liquid you are looking at needing about 1kbar pressure... I could easily be convinced that the phase diagram for water they are working on basically has a limit and beyond that it just gives the same value? meh, its more effort than most go to when designing these things :p
 
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