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Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
I just got about 20lbs (~7Kg) of dry ice. Most of it will be used to keep my lunch cold but I will most likely have some that doesn’t melt by tomorrow night. What kind of cool things can you do with this stuff? (BTW I got it for free at Praxair because it was at the bottom of the bucket and a little bit crushed) Huzza for free things.
*edit* I tried a peizo sparker in the CO2 gas and to my suprize it would not arc.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
I've tried the standard google experiments; blow bubbles into the box and watch them flaot on the CO2 vapor, singing spoon, fog filled bubbles etc. I will be getting a source of radiation in the next few hours and I will try the cosmic ray detector.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
The cosmic ray detector will not work for cosmic rays, but will work with a decent alpha source (smoke detector anyone?). Just make sure that the source is inside the camber (the chamber will block out the radiation). It also helps to shine a bright source of light in the side (ultra bright led might work, a fiber illuminator from a microscope would be ideal) to see the tracks. Don't be discouraged it it doesn't work, they are a very picky devices. Make sure that you warm up the chamber after adding the methanol to fill it with methanol vapor, then super cool it. If you see fog forming on its own you went too far and you need to let it warm up and try again. If you run into too many problems I can send you a scan of the manual to mine.
As to other stuff... Drop ~1cc of it into a glass of some sugary drink (like Hawaiian Punch, Sunny Delight, grape juice, whatever-just make sure it is really sugary) and walk around with the bubbling brew. After the bubbles subside drink the carbonated juice
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
D'oh, it was ethanol not methanol in my rubbing alcohol container. Well that explains that. (My alpha source is from a smoke detector.) I also discoverd the carbonating abilities of dry ice this afternoon on my own. I was shocked to find that the water was not only cold but fizzy.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I am not sure why, but I have yet to see a cosmic ray in mine--ever. I am not sure if it is that they are stopped by the polycarbonate (seems unlikely), or that they just aren't big enough to create a trail, the only trials I ever saw were the strait alpha's coming from the source.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
You could make a sound amplifier. Put some dry ice in a balloon, just a small amount enough to fill the balloon with CO2 and then place balloon a few inches from your ear and listen for faint sounds. Just be sure not to overinflate the balloon or leave chunks of dry ice in it which could cause the balloon to explode damaging your ears.
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Dry Ice
