This is a drawing of the transition from the atmosphere to the interior.
Click on image for full size
NASA

The Structure of Jupiter's Interior

There is no surface to the giant planets, only a gradual change from the atmosphere, as shown in this drawing.

The gases which Jupiter is mostly made of change to liquid inside Jupiter, but the change is very gradual. Therefore the giant planets do not have strict layers, as the earth-like planets do.

The liquid sections of Jupiter form by far the largest portions of the planet, and penetrate very deep into the planet. The first liquid layer inside Jupiter, immediately under the atmosphere, is the liquid hydrogen layer. Under the liquid hydrogen layer is a liquid metallic hydrogen layer.

At the deepest part of Jupiter is the core, which is probably the size of planet Earth.


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