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quote:Originally posted by 4getmenotThis is what is seen everytime i ask this...everyone has a different meaning or explination for what it means, yet there is no "one" meaning for it and that is what i want to know...ya know? It is hard to say...just what truely is meant by it, but i will keep asking and keep looking for it...lol
quote:Originally posted by geckoas for walking on hot coals, anyone can do that because wood is such a poor conducter of heat. walking on hot frying pans would be something else! alot of these mind-over-matter demonstations are simply things anyone can do. most people dont understand the physics behind it, so it seems supernatural.
quote:The Leidenfrost effect is a phenomenon in which a liquid, in near contact with a mass significantly hotter than its boiling point, produces an insulating vapor layer which keeps that liquid from boiling rapidly. This is most commonly seen when cooking; one sprinkles drops of water in a skillet to gauge its temperature—if the skillet's temperature is at or above the Leidenfrost point, the water skitters across the metal and takes longer to evaporate than it would in a skillet that is hot, but at a temperature below the Leidenfrost point. It has also been used in some dangerous demonstrations, such as dipping a wet finger in molten lead and blowing out a mouthful of liquid nitrogen, both enacted without injury to the demonstrator. There have been claims that the effect is also involved when walking on fire, but this contention remains controversial. The effect is also responsible for the ability of liquid nitrogen to skitter across lab floors, collecting dust in the process.
quote:Originally posted by lightarrowHello Karen!Yes, you are right, liquid nitrogen is very dangerous, not because of its chemical properties, but because of its temperature (less than -196°C). In the same way as a book or a piece of gum becomes as fragile as glass, your flesh becomes too, and after that, if that part of your body doesn't shatter, those cells are dead forever.You should wear a very thick special suite, liquid proof, heat insulating and that doesn't become brittle at those temperatures.
quote:Originally posted by another_someoneQuoteIt is not just the low temperature that can cause problems with liquid nitrogen, but also as liquid nitrogen evaporates it will displace the air in the room and cause you to suffocate (this is true of any gas, whether nitrogen or otherwise – and dry ice is theoretically even more dangerous than dry ice, since the evaporating CO2 is actually toxic, whereas nitrogen is not).GeorgeI think this should read: and dry ice is theoretically even more dangerous than liquid nitrogenGaia xxx
It is not just the low temperature that can cause problems with liquid nitrogen, but also as liquid nitrogen evaporates it will displace the air in the room and cause you to suffocate (this is true of any gas, whether nitrogen or otherwise – and dry ice is theoretically even more dangerous than dry ice, since the evaporating CO2 is actually toxic, whereas nitrogen is not).George