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Desc:Two guys try to demonstrate pouring liquid aluminum. Hilarity ensues.
Category:Educational, Accidents & Explosions
Tags:fire, Aluminum, Molten, plonk
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Comment count is 47
Please submit comprehensive scientific explanations as a reply to this comment.
The McK
They dumb.

Scrotum H. Vainglorious
Chem 1A students.
I'm assuming the crucible popped due to the thermal shock of coming out of the little oven into room temperature too quickly? It seems like it'd be designed to be able to take that.
I thought it was the mold they were pouring it into that popped from being heated up so rapidly.

Syd Midnight
Watch it like 20 times and you'll see that it happens on the left side of the right trough of the mold, maybe a tiny crack or a bubble in the metal, but the liquid metal definitely blows out from there.

I think what happened is as the aluminum flowed to the left side, due to the large amount of surface tension, a bubble of air was able to get trapped beneath it when the flow hit the left side, and that bubble of air expanded rapidly so as to cause the explosion.

Guys I'm pretty sure it was the mysterious incantation at the beginning of the video.

Bernoulli's principle at work once again. The air flow around the aluminum caused decreased pressure which compressed the aluminum to its incompressable state - resulting in an unsteady potential flow of H2O. To put it in laymens turns, this would be like peeing on a burning building: not going to solve the problem but may show up on Youtube.

An air bubble in a crack seems like the most likely explanation, yeah. Especially if there was also moisture trapped along with it.

Yep, tiniest bit of moisture = steam explosion = molten metal all over your face.

glasseye got it right. They warned us in shop class and anytime I've seen molten metal demonstrations that if there's a tiny amount of any type of watery liquid around it will flash to steam and explode. First time I've seen it happen.

*pfft*! You "scientists" done don't know nothin'!

JESUS did it!

I imagine this is one of the reasons why every successful casting pour I've seen videos of involved heating the mold to a high temperature as well.

Also their mold is just sitting on top of the plastic* tabletop, I'm sure that wouldn't have melted as the mold heated up from thousand+ degree molten metal.

45 seconds to find a fire extinguisher
Syd Midnight
then spraying it on a red hot crucible that's burning the desk, and being surprised that the desk starts burning again

James Woods
19 seconds to think of swatting at it with a glove.
I'm sure you're just a glove-swatting machine who would only have taken .02 seconds to start swatting. Then your massive intelligence could have willed the fire extinguisher over .03 seconds later. So efficient.

The T-1000 was a lot scarier in the movies.
Big Beef Burritos Supreme
Oh fuck! What now?

Lets just stand around barking!
Good, clear thinking there, guys.
Never seconds to realize the guy with the full face shield maybe should have poured.
Caminante Nocturno
Maybe they should experiment with how to react calmly in an emergency.
Or how to go to the academic advisor's office and change their major to business or some other stupid crap.

Even as business majors, these guys would find some way to be irrevocably burned by molten metal.

Most business majors deserve to be burned by molten metal, so it works out.

Dutch Oven Fresh Pie
These guys are in high school

(I looked at the tags)

As a business student, I say, "Heeeeeeeeeyyyyy....waitaminnit."

What the hell kind of high school has the students working with molten metal?

What? Goddammit man, my high school fucking sucked.

These are the same sorts of guys who stick forks in the electrical sockets in science labs.
What do you mean, it "popped"?


now, what was it you were doing?

I love everything about this video. School labs are awesome, in my organic chem lab a girl spilled about a liter of ether all over a work bench and didn't even think to warn anyone.
"you had your face shield on?" "yes, yes"
Actually, the guy pouring only had goggles on.
Well, of course they lied. They were probably still scared shitless.

"My eyes! The goggles do nothing!"

The guy with the goggles is fucking lucky he doesn't have a hole in face. "You had your face shiel.... Oh God."

Eso les pasa por intentar hablar espaņol, gringos pendejos.
Mister Shady
Fuck you, Mexican troll.

-1 for no permanent disfigurement via molten aluminum.

That's right, you tell him!

Get back under your bridge spanning the Rio Grande!

The video ends right before the good questions begin. They should show this video to all prospective high school science teachers.
god punishing the heathen folk
And that's why I teach in the social sciences.
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