Plastic/rubber - absorbing water

[Ken Smith]

It seems, at present, that the atmosphere has a multi-layer structure,
much more complicated than Earth's, and it's possible that there are
layers in which carbon-based life could exist. But it wouldn't be much
like our land-based life-forms, because of the gravity. More like
jellyfish, perhaps; neutral buoyancy.

I don't think they would have radios to listen to while they float around.

 

[Ken Smith]

I once read that there's no such thing as "on Jupiter", i.e., it
has no well-defined surface - it's gas all the way down to the
core, which, according to Carl Sagan, is "liquid metallic hydrogen."
Well, I suppose there's a liquid/gas boundary...

Anybody know?

None of us have been there I trust. I think it is a good bet that there
is a bunch of iron and other heavy stuff near the core. Iron is fairly
common so at least some will have gotten in there. The center would not
be made from a pure material so figuring out its nature would be a complex
question.

 

[Ken Smith]

ISTR that the mass/density of Jupiter didn't work unless it had a rocky core.

I think arguing for a rocky core is taking things a bit far. An iron core
would be denser than a rocky one and thus could be smaller to get the same
mass.

 

[David Brown]

Ken Smith wrote:
[...]

Capacitors will mostly survive 1000PSI but plastic ones change in value
and any with a metal can deform. If a brand of plastic capacitor survives
once, chances are all of them will.

Avoid can electrolytics - they can squash under pressure. Oil is even
worse for them - they will absorb oil like a sponge, swell up and pull
themselves off the board.

I've never seen can electrolytics absorb oil. What kind of oil were you
using?

I don't know what sort of oil it was, nor exactly what type of
electrolytic it was (other than it was a fairly big can electrolytic,
for bulk capacitance in a power supply). I've seen the same thing
happen in a big cap in an amplifier, after our cat pee'd on it :-(

 

[Ken Smith]

Ken Smith wrote: [...]

I've never seen can electrolytics absorb oil. What kind of oil were you
using?

I don't know what sort of oil it was, nor exactly what type of
electrolytic it was (other than it was a fairly big can electrolytic,
for bulk capacitance in a power supply). I've seen the same thing
happen in a big cap in an amplifier, after our cat pee'd on it :-(

Was the oil perhaps something intended as a fuel or hydraulic oil? Both
of these contain agents to keep things clean.

Any rubbery material is likely to be attacked by chlorine containing
solvents. I wouldn't expect to find this in something refered to as "oil"
however.

 

[Keith Williams]

I think arguing for a rocky core is taking things a bit far. An iron core
would be denser than a rocky one and thus could be smaller to get the same
mass.

Why would Jupiter have refined its core when the rest of the solar system
didn't? The argument is that the lighter elements were blown outward in the
solar system by the solar wind, leaving the inner planets rocky and the outer
gaseous. Jupiter may then be somewhere inbetween (or maybe all the giants have
a rocky core).

 

[John Woodgate]

I read in sci.electronics.design that Ken Smith

I don't think they would have radios to listen to while they float around.

Read Clarke's story 'Meeting with Medusa'. The medusas used electricity
as a defence and had biological radio antenna arrays, possibly for
communication but maybe to tap Jupiter's own radio emissions for energy.

Of course, this is SF, but there is nothing in the story that is
inconsistent with modern physics.

 

[John Woodgate]

I read in sci.electronics.design that Ken Smith

Doesn't "on Jupiter" imply on the surface and hence very deep in the
atmosphere?

No, you are thinking planet-bound. Do you leave Planet Earth when you
fly in an aircraft?

 

[John Woodgate]

I read in sci.electronics.design that Keith Williams <[email protected]>

ISTR that the mass/density of Jupiter didn't work unless it had a rocky
core.

Nobody knows. Hypotheses about the cores of gas giants include;

Metallic hydrogen - we've never seen it so we don't know how dense it
might be.

Diamond.

Iron and other heavy metals.

 

[John Woodgate]

I read in sci.electronics.design that Ken Smith

I think arguing for a rocky core is taking things a bit far. An iron
core would be denser than a rocky one and thus could be smaller to get
the same mass.

Rock couldn't exist at the pressures and temperatures involved, any more
than it can below the Earth's mantle.

 

[Rich Grise]

I read in sci.electronics.design that Ken Smith


No, you are thinking planet-bound. Do you leave Planet Earth when you
fly in an aircraft?

I think this is semantics. Would anyone argue that while they're in
an airplane, they're "on Earth"? I'd think they're a little above
her - they're certainly not on the surface.

Thanks,
Rich

 

[John Woodgate]

I read in sci.electronics.design that Rich Grise <[email protected]>

I think this is semantics. Would anyone argue that while they're in an
airplane, they're "on Earth"? I'd think they're a little above her -
they're certainly not on the surface.

If they aren't on Earth, are they on the Moon, or Mars? Yes, semantics
HAVE to change when you are changing your viewpoint very considerably.

Are you 'on Earth' in a submarine? You are not on the surface.

 

[Rich Grise]

I read in sci.electronics.design that Rich Grise <[email protected]>


If they aren't on Earth, are they on the Moon, or Mars?

They're "in the air".

Yes, semantics
HAVE to change when you are changing your viewpoint very considerably.

Are you 'on Earth' in a submarine? You are not on the surface.

No, silly, in that instance you're "under water".

Cheers!
Rich

 

[Ken Smith]

No, you are thinking planet-bound. Do you leave Planet Earth when you
fly in an aircraft?

I avoid flying in aircraft because I'm always worried that I will leave
the Planet Earth as a result. Does that count?

Yes, I know that the odds of my being killed in a wreck on the way to the
airport are greater than the odds of dieing in a plane crash. This is
why I avoid driving to the airport too.

 

[Ken Smith]

On Fri, 30 Sep 2005 17:13:09 +0100, John Woodgate wrote: [...]
I think this is semantics. Would anyone argue that while they're in
an airplane, they're "on Earth"?

I certainly would if by doing so, I could give John Woodgate's leg a
little tug. As it happens, I have to claim that in an aircraft you are
not on earth.

 

[Ken Smith]

No, silly, in that instance you're "under water".

But, but, but, typically you are above a lot more water than you are
under.

 

[Ken Smith]

Why would Jupiter have refined its core when the rest of the solar system
didn't?

Do you have a reference for the earth not having an "iron core"?

 

[Ken Taylor]

I avoid flying in aircraft because I'm always worried that I will leave
the Planet Earth as a result. Does that count?

Yes, I know that the odds of my being killed in a wreck on the way to the
airport are greater than the odds of dieing in a plane crash. This is
why I avoid driving to the airport too.

[email protected] forging knowledge

Of course you avoid driving to the airport, when you won't fly anyway!

Ken

 

[keith]

Do you have a reference for the earth not having an "iron core"?

AFAIK, the Earth is sorta unique here. The other rocky planets don't seem
to have an iron core or for some reason aren't *nearly* as magnetic. In
any case, the Earth's iron is a fluid and the rock "floats" on top (the
"refining" process). Were Jupiter similar it would have a rocky "core", or
at least surface (which is really what we were discussing).