It is an example of physical change. The molecules are not changing, so it is not chemical, and a physical property is something that a physical thing has.
If you increase the volume the pressure will decrease. so the best answer is C
Jupiter's atmosphere is composed predominantly of hydrogen and helium, but if you have to select any one option then we can look at the percentage of existence of these elements that would be
<span>90 percent hydrogen.
remaining 10 percent is helium
so choose Hydrogen.</span>
