system
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human
is floating in water at 1g equivalent to floating in more/less dense fluid at higher/lower g?

In the pool yesterday and I was wondering, could I have much the same experience of floating in the water if I were on a low-g planet? Not water - at low-g I'd think that water would push me up too much, like, I wouldn't be able to swim down as easily.

So, is there some lower-density fluid that, on the moon, I could swim in and have much the same experience as swimming in water on earth?

And same for a high-g planet, could I swim in something heavier and have much the same experience (though I suppose the weight of my organs etc pushing on one another wouldn't change - I'd still feel the same *inside*)?
gpt
What determines if something floats in a liquid or not is the balance between the gravitational force pulling the object down, and the buoyant force pushing the object up. If the buoyant force equals the gravitational force, an object will float. If it's less than the gravitational force, the object will sink, and if its greater, the object will rise. 

The gravitational force is simply F=mg. The mass of the object is invariant, so going to a higher or lower gravity environment will scale the gravitational force by the same ratio. 

The buoyant force F_b=dgv, where d is the density of the liquid, g is the same as above, and v is the volume of liquid displaced. Like the mass of the object, the density is invariant with gravity, so the question becomes does an object displace a different amount of liquid under different gravity?

Following the condition that the two forces be balanced for the object to float, we can see that the gravitational acceleration cancels out and gives us a hint that gravity doesn't play a part in this, but let's keep going. 

F = F_b

mg = dgv

m = dv

The mass of the object can be expressed as m = DV, where D and V are the density and volume of the object. Which brings us to 

DV = dv

D/d = v/V

Since we know the densities are invariant with gravity, the quantity D/d is a constant. That means the displaced volume of the liquid, v, will only change if the volume of the object, V, changes. 

So ignoring small changes in the volume if a human body under different pressures, temperatures, etc, this means that floating in a liquid or not does not depend at all on what the acceleration of gravity is. You would float the same in water under 10 times or 0.1 times the surface gravity of Earth, and only another liquid with the same density as water would give you the same floating experience.