This is a drawing which depicts what Jupiter's atmosphere is made of.
Click on image for full size
NASA
An Overview of Jupiter's Atmospheric Composition
Jupiter's atmosphere is mostly made of the simple molecules hydrogen and helium.
Sulfur is present there, as well as nitrogen and oxygen. Nitrogen and oxygen make up the air that we breath every day on Earth.
These molecules combine to make clouds of complex molecules, such as clouds of water and smog.
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Jupiter's atmospheric environment is one of strong gravity, high pressure, strong winds, from 225 miles per hour to 1000 miles per hour, and cold temperatures of -270 degrees to +32 degrees (freezing temperature).
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...moreThe troposphere of Jupiter is where the clouds are. Clouds form in regions of strong atmospheric motion, when condensation takes place. The troposphere is the region rapidly stirred by vertical motions.
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