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Thread: Mixing cola and liquid nitrogen - GIF

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    Supporting Member Altair's Avatar
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    Mixing cola and liquid nitrogen - GIF


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    baja (May 13, 2022), durrelltn (May 12, 2022), nova_robotics (May 12, 2022), rlm98253 (May 12, 2022)

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    Supporting Member Frank S's Avatar
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    He was having a blast with that one. pun intended

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    Supporting Member Karl_H's Avatar
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    This doesn't seem much different than the rockets we used to launch with water and an air pump.

    High pressure forces water out through a nozzle - Newton's third law and off she goes.

    The high pressure comes form either the pump or the evaporating liquid nitrogen. (perhaps there is additional pressure from the carbon dioxide in the coke, but I doubt that amounts too much.

    Mixing cola and liquid nitrogen - GIF-rockets.jpg

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    Supporting Member Frank S's Avatar
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    Supporting Member Bony's Avatar
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    Supporting Member Hoosiersmoker's Avatar
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    So what went up from his hands if the bottle is on the ground near him? In slow-mo it looks like the bottle takes off out of the frame at a high rate of speed. There doesn't appear to be anything that goes out or down from his hands?
    "This country was founded by a bunch of slave owners that told us all men are created equal..." - George Carlin

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    How much insulation does a couple mil thick plastic provide? Liquid nitrogen on top of cola, then he grabs the nitrogen fill end bare handed . . . clearly I am forgetting some of my physics.

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    So the $99 question is where can you buy liquid Nitrogen?

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    Supporting Member Karl_H's Avatar
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    Quote Originally Posted by tlnixon View Post
    So the $99 question is where can you buy liquid Nitrogen?
    My 99¢ question is do you really care or are you being silly? I was silly and Googled it.

    Airgas.com offers it. The smallest container I could find (in 2 minutes of research) is 160 liters. The page said to enter my zip code or sign into my account for price and availability. I put in my zip code and got a red letter reply that basically said "we aren't touching this with a 10 ft pole. You have to talk to real people before we will give you any more info.

    On another site it was suggested the price is somewhere between $0.50 and $2.00 USD per liter.

    I have seen some machining videos where they soak a part in liquid nitrogen to get it to shrink to provide a tighter than press fit fit (when the other part is way too big to thoroughly heat.)

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    Supporting Member Bony's Avatar
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    Many years ago it used to be available in Tasmania (where I live) at CIG now BOC, a supplier of welding, medical & refrigeration gases. They compressed gas on site, but you needed a very good reason to be supplied. Schools & universities could get a litre or so at a time, I remember watching an egg and a tennis ball that had been dipped in liquid nitrogen break into thousands of pieces when dropped onto concrete. I very much doubt if it's available for just anyone who wants it due to OH&S, terrorism etc.

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