# Should a given object be more buoyant in liquid mercury than in liquid water?

The answer is an emphatic $\text{YES}$.
Consider: (i) Archimedes principle, any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object, and (ii) the density of mercury ($13.5 \cdot g \cdot m {L}^{-} 1$).
When a body floats in water, the body displaces a volume of water equal to the volume of the body. An upwards force results. On the other hand, mercury is a fluid much more dense than water ($10 \times$ more in fact).