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December 26, 2004

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Larry

Metallic Hydrogen Properties: (paired metal)
Electronic energy band gap: 15 eV - uncompressed insulator
Electronic energy band gap: 0.3 eV - Metal @ 4000 K and 1.4 Mega-atmospheres (Matm)
Electrical Resistivity: ~0 ohm*m - Type II Superconductor @ 4000 K and 1.4 Mega-atmospheres (Matm)
Standard Density: 2696.487 kg*m^-3 (2.696 g*cc^-1)
Metallic Density: 24268.3899 kg*m^-3 @ 4000 K (24.268 g*cc^-1)
Tensile Strength: ~40-50 kg*mm^-2 @ 4000 K
Propellant Efficiency: 5*liquid H2/O2
Incipient vaporization: ???
Complete vaporization: ???

What can be learned from Shoemaker-Levy 9 ?

Carlos

Hi Larry! Thanks for the data. Unfortunately, none of the waves detected when Shoemaker-Levy hit Jupiter seem to correspond to deep seismic waves, which is a shame.

douglas

I love you, man.


Doug M.

Natalie

Hey Doug, is there something going on between you and my husband? Or is it Carlos that you love? Or both of them? As for the post -- EEEK! I barely passed basic physics and calculus. My eyes were crossed...

Natalie

Bernard Guerrero

Very cool, dude.

Quick, Robin, to the MATLAB!

Pouncer

Since I begin to expect a birthday present in 2029 for which these calculations are pertinent, I'm pleased to see thought going into it.

Carlos

Pouncer, here are some sadly recently applicable equations:

For impacts in deep water r kilometers away, the wave height is roughly equal to 6.5 meters * (1000 km / r) * (the yield of impact in gigatons) ^ 0.54

For impacts in shallow water, the wave height is roughly equal to 1450 meters * (the depth of water / the distance away in the same units) * (the yield of impact in gigatons) ^ 0.25

The maximum wave run-in is roughly 1 kilometer * (the wave height / 10 meters) ^ (4/3)

Remind me to write about Vrancea before it becomes pertinent.

C.

Bernard Guerrero

By George, Carlos, you've given me an Idea. Not ripping moons apart, as fun as that would be. But all this got me thinking...

Carlos

Problem is, Bernard, a 1% difference in (say) the hydrodynamic balance for the Sun would cause it to collapse in less than an hour. I don't think the US has _ever_ had that level of accuracy in its balance of payments accounts.

Robert

Very minor quibble: In the second equation, gamma is exactly equal to 5/3 in the case of a *monatomic* ideal gas (i.e. ok for the sun, not for the earth's atmosphere.)

Carlos

Ah, good catch!

A little more on gamma: it's exactly 7/5 for an ideal diatomic gas -- and pretty close to that for air, not that the Earth's atmosphere is going to show up at this level of resolution -- and gets closer to one as the gas molecule gets more complex. (Not that I need to tell Robert this.)

I gather it's part of the reason that the state of the art has moved away from Tillotson to Sandia's ANEOS (ANalytic Equations Of State) and M-ANEOS programs (molecular ANEOS, insert Hands of Fate reference here).

C.

dennis

and what's more... it is art.

http://www.evelynrosenberg.com/process.html

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