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(io9)   Scientist + liquid nitrogen + 1500 ping pong balls = boomhappy funtime   (io9.com) divider line 44
    More: Cool, table tennises, liquid nitrogen, rocket launch  
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9861 clicks; posted to Geek » on 20 Sep 2012 at 11:41 AM (1 year ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2012-09-20 11:24:49 AM
"OK, who wants to help me clean up?"

*stampede*
 
2012-09-20 11:52:53 AM
www.redmeat.com
 
2012-09-20 11:53:42 AM
Her skirt didn't even move. Try again.
 
2012-09-20 11:56:08 AM
It would be more entertaining to pick lottery numbers like that, or play beer pong.
 
2012-09-20 12:07:19 PM
used about 350% the nitrogen he needed... very wasteful.
 
2012-09-20 12:07:48 PM
I prefer the ping pong balls/mouse traps demonstration of chain reactions.

The presenter was way too happy-snide and could have done the demo with a cherry bomb and avoided the LN2 BS.

/yes I'm crabby today
 
2012-09-20 12:11:54 PM
That's pretty damn cool. Next I'd like to see that with a bunch of small rubber bouncy balls.
 
2012-09-20 12:22:01 PM

mark12A: The presenter was way too happy-snide and could have done the demo with a cherry bomb and avoided the LN2 BS.


The demo was likely to a chemistry class or high school students and intended to show the relationship between pressure, volume, and temperature. A cherry bomb doesn't have the same effect.
 
2012-09-20 12:26:53 PM

prjindigo: used about 350% the nitrogen he needed... very wasteful.


LN really isn't all that limited a resource, especially not when inspiring all these kids/people.
 
2012-09-20 12:27:51 PM
I doubt a cherry-bomb would have lofted the ping-pong balls. For all the noise they make, they aren't very large.

You can also preform this feat with 128 Fizzies(R) in the bottle and a liter of water. If you don't mind wet purple balls all over.
 
2012-09-20 12:30:08 PM
While I was in school a professor filled a Nalgene bottle with LN2 and capped it, claimed he was in a rush and absent minded. It went off like a bomb. The bottle turned into shrapnel that went through pretty much everything in the lab. Broken glass, ceiling tiles, ect. The guy ended up with a bunch of cuts and had to get a few stitches.
 
2012-09-20 12:32:26 PM
And that , boys and girls, is how a claymore works. Does everyone understand why you point that side towards the enemy?
 
2012-09-20 12:32:47 PM

Hawnkee: That's pretty damn cool. Next I'd like to see that with a bunch of small rubber bouncy balls.


Will rubber duckies suffice?
 
2012-09-20 12:35:07 PM

dj_spanmaster: prjindigo: used about 350% the nitrogen he needed... very wasteful.

LN really isn't all that limited a resource, especially not when inspiring all these kids/people.


Helium on the other hand...
 
2012-09-20 12:36:33 PM
natazha

... If you don't mind wet purple balls all over.

Ow!
 
2012-09-20 12:37:32 PM
It would have been nice if we could have just gotten a direct link to the YT video they ripped off:
Link

No one wants to go to a Gawker site. They suck. They post embedded YT videos and then write a paragraph about what you just saw. No value added. In fact, value detracted. Come on, people!
 
2012-09-20 12:40:08 PM
Millions of children raised on you tube videos are going to be really unhappy adults when they realize that their career in 'science' does not in fact involve blowing shiat up.
 
2012-09-20 12:42:00 PM
I love teachers like that.

CSB: When I was in High School, decades ago, I had a chemistry teacher named Mr. Marek who would do all sorts of crazy things in the name of science...

Cinnamon-powered rocket
Nitro Tri-iodide
Thermite
etc...

After I graduated, he actually had me come back in and help him once.. I stuffed a rubber glove full of coctail weenies and then stuck it in my sleeve pretending it was my hand, I walked in the room while he was doing a liquid-nitrogen presentation and he grabbed my fake 'hand' and stuck it in the LN, as I screamed and mocked pain.. then he hit it with a hammer, at which time, I ran out of the room screaming..

Fun times... fun times.

/ He appeared on Letterman multiple times over the years.
// I miss that guy, he was a blast.
 
2012-09-20 12:55:18 PM
Mr. Moose's last stand.
 
2012-09-20 01:23:24 PM

NeoCortex42: dj_spanmaster: prjindigo: used about 350% the nitrogen he needed... very wasteful.

LN really isn't all that limited a resource, especially not when inspiring all these kids/people.

Helium on the other hand...


...can (and will) be harvested from natural gas wells, when the price point is right (read: when the government stops subsidizing).
 
2012-09-20 01:24:56 PM
What, no knock-knock joke first?
 
2012-09-20 01:36:04 PM

Egoy3k: Millions of children raised on you tube videos are going to be really unhappy adults when they realize that their career in 'science' does not in fact involve blowing shiat up.


But it can
 
2012-09-20 01:56:51 PM
natazha:

You can also preform this feat with 128 Fizzies(R) in the bottle and a liter of water. If you don't mind wet purple balls all over.

Sounds like a typical weekend at the Kardashians.
 
2012-09-20 02:01:09 PM
My current chem instructor loves to show examples on a whim. He gets an idea, goes into the supply room, and grabs some stuff, and goes to town, sometimes in an unsafe manner.

A couple of weeks ago he made ammonia, and then stuck it up to a guys face and said "smell". Last week he made chlorine gas outside of the fume hood.

The fact that he has not thrown the copious amounts of sodium lying around into water perplexes me.

/if he will not do it, than I will.
 
2012-09-20 02:03:56 PM
Seems like a big damn mess to demonstrate most things expand when going from a liquid to a gas.
 
2012-09-20 02:08:28 PM
When I worked at a tire shop, we used to drill holes into the sides of 20oz plastic soda bottles, throw in a valve stem, hook them up to air, and blow them up in trash cans.

The manager would come running out thinking a car had fallen off a lift. It was that goddamn loud.
 
2012-09-20 02:08:42 PM
www.tvparty.com

Approves.
 
2012-09-20 02:39:05 PM
i2.photobucket.com
 
2012-09-20 02:41:58 PM
Way to handle LN2 without gloves, dumbass.
 
2012-09-20 02:48:40 PM

Quantum Apostrophe


Good old red meat

// first thought in my head was "those aren't ping pong balls".
 
2012-09-20 03:28:19 PM
i49.tinypic.com

Take one of these, cut the strip holding the cap to the tube, drop in a tiny chip of dry ice, cap it, put it down (quickly) with the point up, jump back.

I put many holes in the lab ceiling tiles that way.
 
2012-09-20 03:43:34 PM
That was awesome.
 
2012-09-20 04:14:07 PM
That. Was. AWESOME.

And I loved the way that the garbage can stayed upright.
 
2012-09-20 04:19:27 PM

Teknowaffle: My current chem instructor loves to show examples on a whim. He gets an idea, goes into the supply room, and grabs some stuff, and goes to town, sometimes in an unsafe manner.

A couple of weeks ago he made ammonia, and then stuck it up to a guys face and said "smell". Last week he made chlorine gas outside of the fume hood.

The fact that he has not thrown the copious amounts of sodium lying around into water perplexes me.

/if he will not do it, than I will.


My high school chem teacher (back in the mid-1980s) did a bunch of that kind of stuff:

- Put metallic sodium in water
- Put metallic calcium in water, and lit the resulting hydrogen
- Mixed potassium chlorate and red phosphorus on a lab table and hit it with a hammer
- Put a penny in concentrated nitric acid outside of a fume hood
- Mixed sodium hydroxide and hydrochloric acid, and then rinsed his mouth with it

/That last one: NaOH + HCl = NaCl + H20, i.e. salt water
 
2012-09-20 05:07:24 PM

Cybernetic: Put metallic calcium in water, and lit the resulting hydrogen


Heh, my high school chem teacher did this. He cut the bottom out of a big plastic juice jug and attached it to a ring stand. He lit it with a candle on a yard stick. Must have miscalculated because the ring stand cracked and the jug shot up and broke a ceiling tile.

/Good times...
 
2012-09-20 05:07:24 PM
Interesting that the ping pong balls AND the trash can shot upwards. It's a cannon that recoils in the same direction it shoots.
 
2012-09-20 05:41:21 PM

nevirus: Interesting that the ping pong balls AND the trash can shot upwards. It's a cannon that recoils in the same direction it shoots.


IANAS, but I think that is happening is that as the nitrogen rapidly expands after being released, it forces the water upward and creates a sort of vacuum between bottom of trash can and the expanding area of water being forced up. Or something. Sorta reminds me of the thought experiment showcased on XKCD: http://what-if.xkcd.com/6/
 
2012-09-20 08:43:28 PM

prjindigo: used about 350% the nitrogen he needed... very wasteful.


We used to do that at the engine shop with 2L bottles and WAY less liquid N2. Set them in the middle of the parking lot in the sun and BLOOEY! followed by much laughter and then shouting by the boss about wasting nitrogen.

The ping pong balls would have been great.
 
2012-09-20 08:56:11 PM
Modguy: IANAS, but I think that is happening is that as the nitrogen rapidly expands after being released, it forces the water upward and creates a sort of vacuum between bottom of trash can and the expanding area of water being forced up. Or something.

I think the recoil forced it into the ground, but since it was already touching the ground, it bounced.
 
2012-09-20 11:15:33 PM
Meh... I once saw a woman do that same trick with her vagina...

XD
 
2012-09-20 11:44:41 PM

Fark Me To Tears: Meh... I once saw a woman do that same trick with her vagina...

XD


With 1500 ping pong balls? Was it your mom?
 
2012-09-21 12:02:14 AM
www.tvparty.com
 
2012-09-21 04:52:04 AM
We used to do do the same kind of thing with the iron-magnesium flameless ration heaters that came in MREs when I was in the Army. They make great improvised artillery and grenade simulators. You just crush up the Fe-Mg cake that fuels the heater into either a 20-oz or 2-liter bottle, add about a half cup of water, screw the lid on, toss, and wait about 20 seconds. Boomtastic!
 
2012-09-21 10:08:48 AM

MrBallou: [i49.tinypic.com image 300x300]

Take one of these, cut the strip holding the cap to the tube, drop in a tiny chip of dry ice, cap it, put it down (quickly) with the point up, jump back.

I put many holes in the lab ceiling tiles that way.


Even better, drop them into a graduated cylinder with some warm water in the bottom. That way you can aim them.
 
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