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.
France delivered arms to Syrian rebels, Hollande confirms 2014 08 22
President Francois Hollande said on Thursday that France had delivered weapons to rebels battling the Syrian regime of Bashar al-Assad “a few months ago.”
The deliveries took place “a few months ago, when the Syrian rebels had to face both the armies of the dictator Bashar al-Assad and this terrorist group Islamic State,” Hollande told reporters on a tour of the ...
Brooklyn DA exposes hidden Child Sexual Abuse in the Orthodox Jewish Community 2014 08 22
Comment: We all know that the sex abuse cases within the Catholic church have been plastered all over the media in the last 6-8 years, but when do you ever hear about the rapes, sexual molestation and child sex abuse cases within the jewish orthodox community? Is the media helping to cover it? Will they give the same treatment of ...
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ISIS offered to swap Foley for ’Lady Al Qaeda’ - neuroscientist MIT-graduate 2014 08 21 An MIT-educated neuroscientist terrorist known as ’Lady al Qaeda’ was named on a ’laundry list’ of demands from ISIS captors holding James Foley named, it was revealed today.
Petite mother-of-three Aafia Siddiqui is currently serving 86 years in a Texas jail after being arrested with plans for a ’mass casualty attack’ in the US, including infecting people with Ebola and a ...
James Foley beheaded - Financed by USA 2014 08 21
John McCain is a traitorous piece of garbage.
Last year McCain worked with the "Syrian Emergency Task Force" to help overthrow the Syrian government. Investigative work (see the detailed article below) revealed that this task force was just a front organization for AIPAC.
McCain met with known terrorists, including the infamous al-Qaeda. Yeah, the terrorist organization that was behind 9/11 received aid ...