In recent years, mercury has required a bad reputation as a toxic chemical that one should avoid. Back in the day when I was a schoolboy, mercury was the element that was the most fun. We would handle it with bare hands in science classes to measure atmospheric pressure and rejoice when a mercury thermometer broke and we could play with this fascinating liquid metal and its strange properties that would try to form itself into a sphere if possible and would slide over surfaces so easily.
In this video from Cody’s Lab, Cody has about 350 pounds of mercury at his disposal and he looks at what happens when he tries to stand in a vat containing the liquid. In theory he should float because the density of mercury is 13.6 times that of water and that of the human body is almost the same as that of water. So floating is easy but staying upright is hard because you only sink as far as slightly above your ankles and this makes you highly unstable.
Watch Cody try his best.