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A planet's weight does not determine whether it can float in water. It's density is what determines that. Your question should be "Which planet's density is so small that it could float in water?"
The low density of Saturn would allow it to float in liquid water.
Saturn
Saturn has a very low density and it would be able to float on water. The density of Saturn is: 0.687 grams per cubic centimeter.
Saturn would float in water if you could find a big enough tub and the water to fill it.
No, the density of Uranus is 1.27 g/cm3 (the density of water is 1.00 g/cm3), therefore Uranus would sink. The planet that would float in water is the planet Saturn which has a density of 0.687 g/cm3.
Saturn.
The density of Saturn is less than the density of water on Earth. But you'll never see Saturn float, because that would require a really gigantic pool.
The planet Saturn
Saturn could float in water, because it has a density of 0.7 that of water. That is, however, a theoretical construct, because you would need an enormous pool of water, with a gravitational field much larger than anything we have, in order to achieve that state.
Saturn is a gas giant planet, with a less-dense core than some other planets. The planet's overall density, is less than the density of water. Hence the quite correct old saying in astronomy" "If you could find a lake big enough to put it in, Saturn would float".
== == Saturn. With an average density of 0.7 grams/cubic centimeter,density less than that of water it could really float on water.