Hot Ice Planet???

Help me understand this: it's water, but also frozen by high pressure
-- and thus hot???


http://www.cnn.com/2007/TECH/space/0...eut/index.html

"Prisoner at War" wrote in message
oups.com...

Help me understand this: it's water, but also frozen by high pressure
-- and thus hot???


http://www.cnn.com/2007/TECH/space/0...eut/index.html


Well, "hot" is relative... Presumably the investigators
estimated the planet's temperature by taking into
consideration things like proximity to its sun, the sun's
luminosity, the planet's albedo, probable atmosphere, its
mass and likely composition (radionuclids), etc.

Under enough pressure water can remain solid at remarkably
high temperatures. Have a look at the phase diagram at

http://www.lsbu.ac.uk/water/phase.html

At a proposed temperature of 520K, the water must be in
the form of ice VII, X, or XI. I doubt that the pressure
could be high enough for X or XI.

Prisoner at War wrote:
Help me understand this: it's water, but also frozen by high pressure
-- and thus hot???


http://www.cnn.com/2007/TECH/space/0...eut/index.html


yes, see http://en.wikipedia.org/wiki/Ideal_gas_law
for pV=nRT

This about it - in a pressure cooker, water can get hotter that 100C if
the container is tight enough and there's no room for it to expand.
Similarly, 'dry ice' frozen CO2, is a solid which never goes to a
liquid, it just sublimates (evaporates straight to a gas). Kind of how a
thin sheet of ice on your driveway will do the same in the winter even
though the temp is below freezing.
JOE

"Prisoner at War" wrote in message
oups.com...

Help me understand this: it's water, but also frozen by high pressure
-- and thus hot???


http://www.cnn.com/2007/TECH/space/0...eut/index.html


http://www.cmmp.ucl.ac.uk/people/finney/soi.html

Note that, for ice VII, as the pressure increases, so does
the melting point.

George

Prisoner at War wrote:

Help me understand this: it's water, but also frozen by high pressure
-- and thus hot???

http://www.cnn.com/2007/TECH/space/0...eut/index.html

http://www.lsbu.ac.uk/water/images/phase.gif
Water phase diagram.

Squeeze water to 10^11 Pa and it is a solid to at least 1000 K. What
is a megabar between friends?

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2

On May 18, 8:04 am, Prisoner at War wrote:
Help me understand this: it's water, but also frozen by high pressure
-- and thus hot???

http://www.cnn.com/2007/TECH/space/0...eut/index.html

Practically any material can be solid at any temperature, provided
sufficient pressure is applied.

"Igor" wrote in message
oups.com...
On May 18, 8:04 am, Prisoner at War wrote:
Help me understand this: it's water, but also frozen by high pressure
-- and thus hot???

http://www.cnn.com/2007/TECH/space/0...eut/index.html

Practically any material can be solid at any temperature, provided
sufficient pressure is applied.

I didn't think helium could be frozen, but I was wrong.
Frozen helium is a supersolid, a solid that flows like a liquid.
http://www.planet-think.net/science/...id_helium.html

This means "gas" giants are mostly solid.


Russell
- 2 many 2 count

"Russell Easterly" wrote in message
...

"Igor" wrote in message
oups.com...
On May 18, 8:04 am, Prisoner at War wrote:
Help me understand this: it's water, but also frozen by high pressure
-- and thus hot???

http://www.cnn.com/2007/TECH/space/0...eut/index.html

Practically any material can be solid at any temperature, provided
sufficient pressure is applied.

I didn't think helium could be frozen, but I was wrong.
Frozen helium is a supersolid, a solid that flows like a liquid.
http://www.planet-think.net/science/...id_helium.html


At 175 millikelvins

This means "gas" giants are mostly solid.


Where did this idea come from?