However, it's important to note:
* This is a mass percentage, not a volume percentage. Helium is much lighter than hydrogen, so it makes up a smaller percentage of Jupiter's atmosphere by volume.
* The composition varies slightly with depth. The deeper you go in Jupiter's atmosphere, the higher the pressure and temperature, which can affect the proportions of different elements.
Therefore, while 10% is a good general figure for the concentration of helium in Jupiter's atmosphere, it's not an exact value.
