Archimedes' principle, or the law of buoyancy, says:

Any body wholly or partially immersed in a fluid experiences an upthrust equal to, but opposite in sense to, the weight of the fluid displaced. ("Fluid" means liquid or gas.)

In other words, an object that is submerged in water (or any fluid) has an effective weight that is less than its normal weight under gravity. This effective weight is its normal weight less the buoyant force, the weight of the volume of fluid that the object displaces. If the normal weight of an object is less than the weight of a volume of fluid equal in size to the object, then the object will float in that fluid!

Large construction gives a better, clearer reading. 100 ml, increased water displacement. Both cylinder and cup have 25 ml rings. Includes 100 ml bucket, cylinder, spring scale and overflow can. Support stand and clamp holder are not included.