Why is Saturn so much smaller than Jupiter?

Saturn is smaller than Jupiter primarily due to differences in their formation and the amount of material available in the protoplanetary disk from which they formed. Jupiter, being the largest planet in the solar system, had a more substantial gravitational pull that allowed it to accumulate more gas and dust. Additionally, while both planets are gas giants, Jupiter's larger mass has contributed to its greater density and size compared to Saturn, which has a lower overall density. This difference in mass and composition is a result of their unique evolutionary paths in the early solar system.