This is a schematic of the interior of Jupiter.
NASA
The Liquid Hydrogen Layer
The first liquid layer inside Jupiter, right under the atmosphere, is the liquid hydrogen layer. The hydrogen atmosphere becomes thicker and thicker, like a dense fog, with more and more liquid droplets, until the hydrogen completely changes from the gas form to the liquid form. This changes occurs at roughly 1000 km (650 miles) below the level of the first cloud deck.
Once the hydrogen is a liquid, it then behaves like the ocean does in forming currents for the purpose of carrying heat from the inside to the outside of Jupiter.
Under the liquid hydrogen layer is a layer made of liquid metallic hydrogen. This layer also forms complicated currents and motions, but because the layer is metallic, it is also able to conduct electricity. This is what produces Jupiter's big magnetosphere.
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