How to make a floatable part?

Hey ! im here again , and i want a part (its supposed to be lava) if you touch it then damage you but the problem is that i want it to maybe make the person who is in the lava float in the lava because right now i cant do that , it feels just weird just having it non collided , i have the idea maybe changing the gravity to low while in the lava , but i cant do that , help?

function onTouched(hit)
	if hit.Parent:findFirstChild("Humanoid") then
		hit.Parent.Humanoid:TakeDamage(1) wait = 1 and hit.Parent.Humanoid:TakeDamage(1)
	end
end

script.Parent.Touched:connect(onTouched)

Thanks if answered!