Protected By Science My hand is like a red-hot poker to the liquid nitrogen, but an insulating layer of nitrogen gas forms- a phenomenon known as the Leiden-frost effect- keeping my hand safe and warm for a fraction of a second. Mike Walker
When I first saw this photograph of a man’s hand submerged in liquid nitrogen at somewhere below -320° F, my immediate thought was, “That guy must be crazy! One second in that stuff, and you’re shopping for new skin!” My shock was tempered only slightly by the fact that it was my hand, and we’d taken the picture just a minute earlier.
I hadn’t realized that my hand was quite so deep into the liquid. Amazingly, I barely felt the cold at all. My skin didn’t get hurt for the same reason that water droplets dance on a hot skillet. An insulating layer of steam forms almost instantly between the water and the metal, keeping the droplets relatively cool as they float for several seconds without actually touching the hot surface. To liquid nitrogen, flesh is like that skillet—a surface hundreds of degrees above its boiling point. So the moment my hand touched the liquid, it created a protective layer of evaporated nitrogen gas, just as the skillet created a layer of steam. That gave me just enough time to put my hand in and pull it out again. Any longer than that, and frostbite would have set in.
Hot Water: Droplets on a very hot skillet take longer to evaporate than they would on a less-hot surface where no insulating gas layer forms. Mike Walker
The phenomenon is called the Leidenfrost effect (after Johann Gottlob Leidenfrost, the doctor who first studied it in 1756). I’d known about it for years, but when it came time to test it in real life, I have to admit that I used my left hand, the one I’d miss less.
I drew the line at another classic example of the effect. According to the books, it’s possible to stick a damp finger directly into molten lead without getting burned, if you do it fast enough. After some consideration, and remembering the times I’ve been burned by molten lead, I decided that it probably wouldn’t make a very good picture anyway.
ACHTUNG! Do not try this. If liquid nitrogen soaks into your clothes, you will not be protected by the Leidenfrost effect, and you can get frostbite very quickly.
Kansas City Jewish Community Center shooter: “I was an FBI Informant” 2014 04 24 Kansas City Jewish Community Center shooter: “I was an FBI Informant”
…… Which is EXACTLY how we called it when this story broke a few weeks back. We also mentioned that the SPLC, just discarded from the FBI “hate” website… Would be the prime benefactor.
Ex-KKK Leader Was Given a New Identity Years Before Shooting
Glenn Miller Claims He Was an FBI Informant
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Biofuel Made From Corn Waste Less ‘Green’ Than Gasoline 2014 04 24 Biofuel created from corn waste may not be the clean, eco-friendly oil alternative the United States government is hoping for. A new study has found that fuel generated from harvested corn leftovers creates more greenhouse gases than conventional gasoline — at least in the short term.
The fuel under study, called cellulosic ethanol, has been touted in recent years as a ...
Swedes open coffin of 850-year-old king 2014 04 24
Scientists pried open the 850-year-old casket of King Erik the Holy on Wednesday, hoping to find out more about the king, his crown, and his eating habits.
"This was a very special occasion, especially considering the importance of Saint Erik religiously in Sweden," Uppsala Cathedral Chaplain Lars Åstrand told The Local.
The casket contained the bones of King ...
John Kerry and the Pope set to face off with Jewish Knight Templars on the Temple Mount 2014 04 24
This is the week that supposedly spells the end of the peace process or its end. My money is on a continuation that has no real substance or direction.
What’s the alternative?
With Passover and Easter over, Secretary Kerry can return to the Middle East crisis. This, after dealing so successfully with crisis in the Ukraine. [Is the author joking? - RIC]