Archimedes' Principle Experiments and Buoyant Force ...
· In the diagram below we lower a hollow steel ball into the tank. This time we know the weight is 3 kg. The chain goes slack if we move the scales closer to the water surface, because the weight floats and doesn't pull down on it. (In reality the chain has weight and will pull down on the scales, but for the sake of the experiment, let's imagine it's weightless.) The scale .