You should know that liquid nitrogen is one of the coldest substances that we can find. It is used for creating cryogenic chambers and various other applications, always linked to its high freezing. But what if we put the hand in a container filled with liquid nitrogen? the Science answers.
After a while we should certainly have his hands frozen, but as you can see in the video, it does not happen in the very first time. A phenomenon called the Leidenfrost effect Keep Your Hands Protected from low temperatures of nitrogen to avoid any injury.
The Leidenfrost Effect occurs when two very different temperatures come into contact. This meeting creates an “isolation layer”, causing the two materials do not interact directly. In the video, it is shown with the cold water that comes into contact with a hot metal and does not evaporate.
Later on, in the same video, the liquid nitrogen is shown being played on the hands of the creator of the film. As the skin is hot and the nitrogen is very cold, the Leidenfrost effect prevent direct contact of the materials.