what is the nature of gas on jupiter?

Question

you know how gases on earth follow a certain set of laws, how about the gases on jupiter? do they follow the same laws?

Answer 1

A new analysis of data collected by the Galileo spacecraft’s suicide probe as it plunged into Jupiter’s roiling atmosphere in December 1995 has stamped a huge question mark over the prevailing models of how our solar system began.

According to an international team of scientists writing in the November 18 edition of the British journal Nature, the gas giant was found to contain two to three times more of the heavy noble gases Argon, Krypton and Xenon than one would expect had it formed solely from solar nebulae, the leftovers of the formation of our Sun. It also had about three times more nitrogen than would be expected under the prevailing models of how our solar system formed.

Where Jupiter now orbits, about five times the distance from the Earth to the Sun (five astronomical units), it is much too warm to have accumulated those gases in the quantities detected by the probe, according to Sushil Atreya, professor, Atmospheric, Oceanic and Space Sciences (AOSS), and director of the Planetary Science Laboratory at the University of Michigan College of Engineering. Atreya was joined in the research by AOSS colleagues George Carignan, special assistant to the dean and research scientist, and Thomas Donahue, Edward H. White II Distinguished University Professor Emeritus of Planetary Science. A multidisciplinary team from the University of Hawaii, NASA’s Goddard Space Flight Center, Tel Aviv University in Israel, and the University of California at Berkeley participated as well.

Jupiter is believed to have formed from the solar nebula and from a collection of small bodies called icy planetesimals, or micro-planets. Most planetesimals, a class of objects which includes comets, are thought to have formed somewhere between the orbits of Uranus and Neptune, 20 to 30 astronomical units from the sun. Even at that distance, however, the initial temperature of these icy bodies would have been far too warm for them to trap the heavy noble gases and nitrogen in an icy form.

An alternative scenario involves the delivery of these gases to Jupiter by small icy bodies that lie beyond the orbit of Neptune in an area called the Kuiper Belt, which is more than 40 astronomical units from the Sun. But had the planetesimals somehow fallen from their current orbits in the Kuiper Belt to Jupiter’s present orbit, the heavy noble gases and the nitrogen would have largely dissipated in the warmer temperatures before they arrived at Jupiter. So neither theory accounts for what the probe actually found.

“The implications are enormous—how do you do that?” Atreya said.

Could it be, the team now wonders, that Jupiter was initially much further from the sun and that it moved in to its present orbit more recently? It’s either that, or the solar nebula was much, much colder than the models have estimated, said Donahue.

The Galileo probe, about the size of a Volkswagen Beetle, detached from the main Galileo spacecraft in the summer of 1995 and made a fiery one-hour plunge into Jupiter’s windy atmosphere on Dec. 7, 1995. Before being burned and crushed on its descent, the probe took atmospheric chemistry measurements with a mass spectrometer built by the Michigan team and Hasso Niemann of the Goddard Space Flight Center. Its data was relayed to the orbiter passing by high above.

Because of the difficulty of beaming data over the hundreds of millions of miles from Jupiter to Earth, particularly with the crippled antenna Galileo has, data from the probe was saved in compressed form in Galileo’s computer and stored in more detail on its tape recorder. The initial results came from the computer, but the more detailed tape-recorded measurements took two months to be transmitted to Earth.

And it has taken several more years for this team to comb through the data in what Donahue called “a lot of agonizing spectroscopy analysis.” Sophisticated computer modeling was done to try to account for what the probe reported. “This is a complicated calculation, even for the people who are experts,” he said.

But these findings, coupled with the recent discovery of planets in other systems that appear to be much larger than Jupiter and much closer to their stars, may lend support to the idea that gas giants can migrate from one spot to another in their solar systems.

“If Jupiter had migrated inward, it would had to have come from way out there, 40 or 50 astronomical units,” Atreya said. And the Kuiper Belt currently doesn’t have enough mass to account for something the size of Jupiter being formed or the amount of heavy elements now found within the planet.

“You have to characterize our understanding of how the solar system got started as sort of in a state of flux,” Donahue said. Some theorists have even proposed that a Jupiter-sized object could be lurking undetected out in the Oort Cloud, a thin shell of comet-like objects 4 trillion miles from the Sun. “There may be more to the solar system than we know about,” Donahue shrugs.

Both Michigan researchers would like to see additional probes sent to Jupiter and Saturn—another gas giant—to help figure out these riddles. “Imagine working out the entire physics and chemistry of the Earth based on a single probe,” Donahue said. “We certainly would like to know, is this same thing true of Saturn, Uranus, and Neptune?”

The above discussion indicates that the gases present at Jupiter may not follow the gas laws as being followed by gases on the Earth.

Answer 2

There is good and bad news. They follow the same laws; that's good. The laws they follow may not be those you expect; that's not so good.

Jupiter's atmosphere and much of its mass is hydrogen. One major difference between Jupiter and Earth is that on earth, nitrogen and oxygen are in the gaseous state; it is just too warm and not enough pressure to liquefy them or solidify them in the environment. On Jupiter, the pressures developed can actually liquify and solidify hydrogen, and temperatures are about 100 deg K. Most of the planet, other than for a rocky core about the size of the earth is thought to be solidifed hydrogen, which, as the distance from the center of Jupiter increases, is supplanted by a liquid layer, which then gives way to the dense gas atmosphere.

Answer 3

$2 dollars dearer. I like it. :-)

Gases have a set behavior that can be predicted from PVT (pressure/volume/temperature) diagrams and from various mixing rules when there are other species present (chemical interactions affect the Gibbs free energy and drive chem engineers nuts!). Gases everywhere follow the same rules. Some of the rules are unknown, and this drives additional experimentation.

Answer 4

No. For a start, it's about $2 a gallon dearer, and they drive on the other side of the road and backwards.