Well you can find out about the many functions of drilling fluid - the liquid that fills the borehole of a well as it is being drilled. One of these is buoyancy, the ability of a liquid to partially support the weigh of an object, in this case, the steel drill pipe. Here's a demonstration of how this works.
Corn syrup is a good choice.
Make a loop at the other end to hang on the hook of the spring scale. Weigh the screw and record your result. Submerge the screw in water and weigh it again, making sure it is fully submerged but not resting on the bottom of the container or against the sides. Now repeat the procedure with a different liquid. We used corn syrup.