Monday, September 14, 2015

Leidenfrost Effect

In my free time I tend to research a topic that first comes to my mind, lately I have been recently searching up cryogenics and recently came to this whole new scientific phenomenon that is called the Leidenfrost Effect (hence, the title). The Leidenfrost Effect is a truly magnificent thing, if something of an extremely high temperature touches something that is significantly colder than it it will more or less, bounce or bead off. For example: there is a hot plate that gets to be so hot that when water is poured on top of it the water beads up, and rolls right off. The way this works is that a part of the the water evaporates so quickly that a wall of vapor is making a distance between the water and the hot plate. Here is a picture example explaining how it works.


image received from https://en.wikipedia.org/wiki/Leidenfrost_effect
created by wiki user: Vystrix Nexoth

This can also work for multiple other kinds of liquids and solids, such as: pouring liquid nitrogen in short bursts onto a human hand (do not try this at home), also submerging your hand into a vat of liquid nitrogen can produce the same effect. When performed your hand will return completely dry, yet extremely cold, so it is ill advised to practice this because it takes correct timing to perform these tests and can be extremely dangerous. 


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