The buoyant force on an immersed object equals the weight of displaced liquid.
Use the top/right slider (mouse drag the center of scale) to move the object up/down.
When part of the object is immersed in the liquid, the weight indicated on the top scale is reduced.
However, the same amount is increased in the lower scale (support the whole system).
You can change the density of the object or the liquid.

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Weight of an immersed object in liquid
Designed by Fu-Kwun Hwang (http://www.phy.ntnu.edu.tw/ntnujava/)
Deptartment of Physics, National Taiwan Normal University, Taiwan