Solid iron will float in liquid mercury. In most liquids it will sink.
the iron bob floats in Mercury because it density is less than mercurys density
An iron ball floats on mercury because mercury is much denser than iron. The buoyant force acting on the iron ball due to the displacement of mercury is greater than the gravitational force pulling it downward, causing it to float.
Look at the density of each substance. Iron is less dense than mercury, so yes, it will float.
The density of mercury is much greater than that of water, so the nail will not sink. The density of the nail is less than that of mercury and greater than that for water, so it sinks in the water.
Iron sinks in water because it is denser than water. The density of iron is about 7.87 g/cm^3, while the density of water is 1 g/cm^3. This difference in density causes iron to sink when placed in water.
Solid iron will float in liquid Mercury. In most liquids it will sink.
-- The density of iron near room temperature is around 7.9 gm/cc, whereas at the same temperature, mercury is liquid with a density around 13.5 gm/cc. A lump of iron will float nicely in a bowl of mercury at room temperature. -- Don't forget that aircraft carriers and battleships are also pieces of iron, and that they float nicely in water.
Which rock? Any liquid that is dense enough will support a rock; the most common would likely be mercury, in which even iron floats.
No, the density of water ice (0.92) is far below that of mercury (13.6) and so the ice will float on liquid mercury. Even iron density 7.85) and copper (8.73) and lead (11.3) will float on mercury but gold (density 19.6) sinks!
Yes, nickel can float on liquid mercury because the density of nickel is lower than that of mercury. This means that nickel will not sink when placed on liquid mercury, and instead will float on its surface.
No, mercury is denser than ethanol, so it will sink and not float.