that the rise in water level makes the readings[2] higher seems to be a reasonable explanation in the case where the tube is outside the beaker: however. this cannot explain cases 1 and 2. Toexplain and clarify these two situations, they needed to drew free body diagrams and evokr Newton's third law (reaction force due to the buoyancy force) as shown in figure 3(a). One can envision asituation where the water level does not rise if a large body of water with a vast surface is involved. In this case the force remains the same.