Physics of Hydrogen under great Pressur1

Physics of Hydrogen under great Pressur1 - tightly that the...

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Physics of Hydrogen under great Pressure Obviously the physics of "bulk" Hydrogen is important for the gas giants, particularly the way it behaves under immense pressure. The phase diagram for Hydrogen up to 50K and 15 bar shows us the low temperature, low pressure behaviour: We see that the triple point is around 15bar, so as we go down into the interiors of the gas giants we would soon reach a point where the gas and liquid are indistinguishable. In the laboratory H 2 stays liquid to about 10 6 bars at 170K, the lowest temperature likely to be met in the body of Jupiter. We need to do theoretical studies to get beyond this. (This is only equivalent to a few 1000 km below the clouds.) It is predicted that at any plausible temperature you can get no solid Hydrogen formed in the interiors of the giant planets. However, at somewhere around 2-5 10 6 bars the molecules of Hydrogen are forced together so
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Unformatted text preview: tightly that the wave functions of adjacent at wave functions of adjacent atoms overlap, and effectively the bonds between the atoms of one molecule become no more important than the bonds with the atoms in the next molecule: what we have is effectively a continuum of protons through which the electrons swim. This is similar to the situation in a metal, so this is termed "metallic Hydrogen". When trying to model the behaviour of Hydrogen at high pressures we can no longer use the Perfect Gas Law to describe the pressure. As atoms come closer together we have first an attractive force, due to induced charge separation effects, called the van der Waals force. It is in this regime that liquids are formed. Closer still, however, and the cores of the atoms - the nuclei - start to repel. This force is very strong and rises exponentially as the distance between them:...
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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Physics of Hydrogen under great Pressur1 - tightly that the...

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