Saturn is termed a gas giant, but it is not entirely
gaseous. The planet primarily consists of hydrogen, which becomes a non-ideal
liquid when the density is above 0.01 g/cm3. This density is reached at a
radius containing 99.9% of Saturn's mass. The temperature, pressure and density
inside the planet all rise steadily toward the core, which, in the deeper
layers of the planet, cause hydrogen to transition into a metal.
Standard planetary models suggest that the interior of
Saturn is similar to that of Jupiter, having a small rocky core surrounded by
hydrogen and helium with trace amounts of various volatiles. This core is
similar in composition to the Earth, but more dense.







