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I Fully Submerge My Hand in Liquid Nitrogen! 2010-09-21 0:00
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.
Islamic State 'blows up Palmyra arch' 2015-10-06 21:37
Palmyra's Arch of Triumph was built by the Romans in the second Century AD
Islamic State militants in northern Syria have blown up another monument in the ancient city of Palmyra, officials and local sources say.
The Arch of Triumph was "pulverised" by the militants who control the city, a Palmyra activist told AFP news agency.
It is thought to have been ...
ISIS on the Run: Russian Airstrikes Totally Obliterate Terrorist Forces in Just 72 Hours 2015-10-06 4:38 Russia has just achieved, in 72 hours, what the West failed to do in an entire year.
The Su-34 – World’s best machinery for annihilating terrorists.
Numerous news outlets are now reporting that ISIS forces are in total disarray and even, in some cases, completely on the run following the start of Russian airstrikes last week.
Russian Lt. Gen. Andrei Kartapolov said that ...
Oregon Gunman Left Hate-Filled Note and Long Struggled with Mental Issues, Sources Say 2015-10-05 23:21
The gunman who carried out the deadly attack on Umpqua Community College was described Friday as a “hate-filled” individual, with anti-religion and white supremacist leanings who has long struggled with mental health issues, law enforcement sources said.
Officials said Friday they had recovered 13 weapons tied to the shooter, Chris Harper Mercer, 26. Six were found at the college, seven were ...
This is Dildoween 2015-10-05 23:07
Halloween is a fitting metaphor for a society rank with the stench of its own decay. Youtube sensation Uncuck the Right accordingly presents all your favorite alt-right anti-Cultural-Marxist memes in one convenient song and video for the "season of spooks." Enjoy but don't hand out any more free candy.