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Wow Daredevel! I just found out about the Leidenfrost effect - Wikipedia, the free encyclopedia, but I still thought that meant you could only touch something frozen with liquid nitrogen for a few seconds before your skin started freezing.

BTW, in case anyone is wondering, this is true per Mythbusters:


A person’s tongue can instantly stick to a freezing (below 0°C) metal pole when touched, making it difficult to remove.

confirmed

Using both Tory’s tongue and that of a pig, it was determined that a human tongue can be frozen to a cold metal pole substantially enough to risk pulling some of the skin and muscle off of the tongue. Kari jokingly suggested that a person could free his/herself by peeing on the contact point between pole and tongue.
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It does confirm the Leidenfrost Effect. The human tongue is obviously not substantially hotter than water's boiling point 100 °C (212 °F). Compare to liquid nitrogen's boiling point: -196°C ( -321°F).
 
Jazzberry said:
Wow Daredevel! I just found out about the Leidenfrost effect - Wikipedia, the free encyclopedia, but I still thought that meant you could only touch something frozen with liquid nitrogen for a few seconds before your skin started freezing.

BTW, in case anyone is wondering, this is true per Mythbusters:




It does confirm the Leidenfrost Effect. The human tongue is obviously not substantially hotter than water's boiling point 100 °C (212 °F). Compare to liquid nitrogen's boiling point: -196°C ( -321°F).
Click to expand...

I can tell you that I've carried a piece of banana in my hand that was frozen by liquid nitrogen. It was so cold that it felt like it was burning me, so I held it as if it was hot (transferring back and forth between my two hands). However, after maybe 30 seconds, it's not as cold anymore. I wouldn't recommend eating a frozen banana (too much frozen water in it), but frozen marshmallow and graham crackers are good since you still get the frozen effect but it's not as "burning" cold.
 
I recall the old commercials for freeze-dried coffee. They were the rage back then. :lol:
 
Daredevel7 said:
I can tell you that I've carried a piece of banana in my hand that was frozen by liquid nitrogen. It was so cold that it felt like it was burning me, so I held it as if it was hot (transferring back and forth between my two hands). However, after maybe 30 seconds, it's not as cold anymore. I wouldn't recommend eating a frozen banana (too much frozen water in it), but frozen marshmallow and graham crackers are good since you still get the frozen effect but it's not as "burning" cold.
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I won't share my shaving cream prank.... + liquid nitrogen + car + winter day.
 
Jazzberry said:
Wow Daredevel! I just found out about the Leidenfrost effect - Wikipedia, the free encyclopedia, but I still thought that meant you could only touch something frozen with liquid nitrogen for a few seconds before your skin started freezing.

BTW, in case anyone is wondering, this is true per Mythbusters:




It does confirm the Leidenfrost Effect. The human tongue is obviously not substantially hotter than water's boiling point 100 °C (212 °F). Compare to liquid nitrogen's boiling point: -196°C ( -321°F).
Click to expand...

you know what's even cooler?

ypothermia & Paradoxical Undressing. When a person is freezing to the point of hypothermia or extremely cold temperature... he will feel burning hot just like what Vicky described when she held a frozen banana... which will cause him to undress himself to get cooler even though he's having hypothermia.
 
Daredevel7 said:
I can tell you that I've carried a piece of banana in my hand that was frozen by liquid nitrogen. It was so cold that it felt like it was burning me, so I held it as if it was hot (transferring back and forth between my two hands). However, after maybe 30 seconds, it's not as cold anymore. I wouldn't recommend eating a frozen banana (too much frozen water in it), but frozen marshmallow and graham crackers are good since you still get the frozen effect but it's not as "burning" cold.
Click to expand...

When food is that cold does it have any taste?

And what's the story behind all those frozen foods at -321°F? Inquiring minds want to know. :)
 
Jiro said:
you know what's even cooler?

ypothermia & Paradoxical Undressing. When a person is freezing to the point of hypothermia or extremely cold temperature... he will feel burning hot just like what Vicky described when she held a frozen banana... which will cause him to undress himself to get cooler even though he's having hypothermia.
Click to expand...

Who is Vicky?
 
Jazzberry said:
When food is that cold does it have any taste?

And what's the story behind all those frozen foods at -321°F? Inquiring minds want to know. :)
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Hahaha!! :)

As for the taste, when you first put it in your mouth, no not really because your mouth in in shock from it's being so cold. But after chewing it for a while, it warms down really really fast (in seconds) and you have your taste.

As for me eating all those frozen foods at -321°F.... just part of my job as a taste tester. Need to try food at all ranges of temperature and assess their taste.

Where do you think the "Store between 60-100°F" labels come from?
 
Beowulf said:
Would a flash-frozen seed grow after thawing?
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Yep, same process with seeds that are in winter. There is most likely a critical point for how deep it can be frozen depending on which plant species it is, like evergreen trees would respond more easily in the cold than western plants.

All it takes is detection of phytochromes to get it to grow.
 
Daredevel7 said:
Hahaha!! :)

As for the taste, when you first put it in your mouth, no not really because your mouth in in shock from it's being so cold. But after chewing it for a while, it warms down really really fast (in seconds) and you have your taste.
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Cool! (Bad pun intended.) Since I doubt I will ever put a food frozen by liquid nitrogen into my mouth -- thanks for telling me! Interesting to know.

As for me eating all those frozen foods at -321°F.... just part of my job as a taste tester. Need to try food at all ranges of temperature and assess their taste.

Where do you think the "Store between 60-100°F" labels come from?
Click to expand...

Cool! I'll be on the lookout now for packages that have -321°F :)

That sounds like a great job! If you don't mind my asking, what kind of background do employers look for when hiring taste testers? Bet they don't like it when people in your dept. call in sick because of food poisoning. :lol:
 
naisho said:
Yep, same process with seeds that are in winter. There is probably a critical point depending on which plant species it is, like evergreen trees would respond more easily in the cold than western plants.

All it takes is detection of phytochromes to get it to grow.
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what? I'm too stupid to understand any of this!

GUESS-WHAT-THIS-SNAKE-ATE-IT-ATE-A-DOG.jpg
 
Jazzberry said:
Cool! (Bad pun intended.) Since I doubt I will ever put a food frozen by liquid nitrogen into my mouth -- thanks for telling me! Interesting to know.



Cool! I'll be on the lookout now for packages that have -321°F :)

That sounds like a great job! If you don't mind my asking, what kind of background do employers look for when hiring taste testers? Bet they don't like it when people in your dept. call in sick because of food poisoning. :lol:
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:D

I was kidding. I couldn't help but play a little prank....

I am actually an engineer. There is a team in my company who works a lot with liquid nitrogen. Sometimes they have their fun with it..... :D
 
Daredevel7 said:
:D

I was kidding. I couldn't help but play a little prank....

I am actually an engineer. There is a team in my company who works a lot with liquid nitrogen. Sometimes they have their fun with it..... :D
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fun? why they no invite me?

GUESS-WHAT-THIS-SNAKE-ATE-IT-ATE-A-DOG.jpg
 
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