I hope this guy loses his teaching license. This is the most insane dangerous thing I've seen to show to high school students.

I mean it is basically a draino bomb, where the student's probably do not have access to liquid Nitrogen... But they could get dry ice or drano and a metal. Why encourage students just to see cool.

The bottle of liquid Nitrogen could have exploded as soon as he put the cap on. I'm surprised it didn't. That would have been REALLY REALLY bad. He didn't even have face protection. You should not be allowed to handle N2 if you are such a moron.

umm i think its pritty safe and realy scince should be fun and not just reading out of txt books. scince should be realy hands on anny way.

its allso safe becuse if a bomb has nothing to propell like shapnull + it is not using a reactoin that produces mutch heat. then there realy is minimul to no risk evan if the botel went off right next to him the worce thing would be the plastick hiting him and maby some cool vaper going on him. becuse of the way plastick botels are constructed it tends to stay together and just tair slighty. i guess the bucket cold fall on them but its pritty obvousy that amount wont make a bucket that big go to far

That's interesting, I hope he gets a commendation and a huge raise. It is an extreme rarity that a teacher will go out of their way to engage kids in this way. And to actually go out and buy some liquid nitrogen to demonstrate phase change and the combined gas laws? Nearly unheard of. You see Joe, perhaps if you were in that class you'd've learned that the bottle could not 'explode immediately' because it takes time for the liquid to boil and build up pressure and that due to this fact, the sooner the bottle explodes, the less powerful the explosion. The demonstration is safe, exciting and gets the students interested in a way nothing else can. I say bravo Mr. Smith!

ZOMG! You Darwin Award soon-to-be-inductees obviously miss spent your youths. (a) when the plastic bottle explodes there is tons of sharp shards of plastic (b) you think a liter of LN propelled through the air is safe?? (c) LN is boiling as soon as it makes contact with the air, bottle, etc. It just takes time to build up enough pressure to explode. What if the bottle had a defect or blew up in 1 second, 1/2 a second? Sure, it is probably 90% safe, but no something you need to show a bunch of teenagers. Heck, I don't think anything is safe about this. From his lack of protection from even spilling on himself, the immediate boil up that could spray all over his face, the use of hockey gloves to handle LN, his "safety glasses", the bucket being propelled at random. Look I am speaking from experience on this "experiment" and playing with liquid nitrogen.

Heck he could have put a giant balloon on top of the bottle to demonstrate phase change better. It's just cheap to blow stuff up to impress high school students. Look up the Darwin awards for science high school teachers who are featured for their inspired brilliance.

Um I use liquid nitrogen practically every day. I have done the explode a bottle trick many, many times. The way it is conducted in this demo is VERY safe despite what you may think. He actually goes so far as to use nested containers, there is no way plastic can escape and hit anyone.

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