I was reading about why lifting an object in water is easier then in air.
The explanation goes on the line that the water which was above the object will fall downward and sideways, taking the place of the object which was moved.
Now, if we assume the presence of a gravitation field, like earths' one, shouldn't the same logic apply considering air and vacuum?
If this seems legit in a sense, I see it as counterintuitive in another: Would this mean that lifting an object in a denser substance will make it easier?
I don't know what assumption make on the system to prove this statement, and if it could change the answer.
It helps me to think as air (or water) in a limited quantity and in a constrained region, but can't tell if these assumptions would affect teh results.