Because an object immersed in water is buoyed upward by a force equal to
the weight of the displaced water, so the stone's net weight in water is less
than it is in air, by a difference of roughly 62 pounds for each cubic foot of
its volume.
If the question is asking "for what reason would a person lift a heavy stone immersed in water as opposed to air?" then the answer is buoyancy. When immersed in water there will be an upward force on the bottom of the stone due to the volume of water it has displaced. This upward force will make the stone seem lighter to the person lifting it by decreasing the amount of force they need to exert to lift it.
It is easier to lift a heavy stone under water because the water provides buoyant force that counters the weight of the stone. This buoyant force reduces the effective weight of the stone when submerged in water, making it easier to lift. In air, there is no buoyant force to counteract the weight of the stone, so it feels heavier to lift.
rises
you can use a 300ml graduated cylinder water,3different objects
rises
14lbs = 1 stone
62.8kg is equivalent to 9.90 stone.
inclined planes reduce the amount of work to do, its easier to push a heavy stone rock up a ramp then carrying it
11 kg is approximately 1.73 stone.
1 stone is 14lb (fourteen pounds) or 6.35Kg.
The Rosetta stone
12.2 stone is 77.47kg