as an engagement activity for our student, we asked them to predict, observe and explain the following activities based on buoyant forced. The set-up has a water-containing beaker on top of an electric balance. the three panels shown in figure I illustrate what they hed to deal with:(I)A represents the tube with some liquid and B is for an empty tube floating in water;(II)A1 represents the liquid-containing tube being pushed into the water while B remains floating;(III)B1 represents the empty tube pushed to the same depth as A1.What would the students' predictions be? What are the balance readings? What explanation can be given? The students responded to all these questions in various ways -- some incorrect and some correct.The teacher guided them to understand that the buoyant force is proportional to the volume of the displaced water surrounding the tubes. Al students were asked to feel the differences in the force applied to the empty and partially filled tubes in case 3.