From: Tory Brady (toryb@exploratorium.edu)
Date: Wed Dec 18 2002 - 15:17:59 PST
Message-Id: <l03110700ba26b26782d7@[192.174.3.223]> Date: Wed, 18 Dec 2002 15:17:59 -0800 From: Tory Brady <toryb@exploratorium.edu> Subject: Re: pinhole grain elevator and questions
>Hi Mike
>
>Don't forget to mix air into the powder by blowing it into the top of the
>chamber. Don't sprinkle it in.
>
>1. Carbon dioxide goes directly from solid to gas (sublimation)
>and also from gas to solid (also sublimation)
>
>2. Iodine also sublimates at room temprarture.
>Water sublimates on Mars.
>
>3. Plasma is a higher energy state than gas.
>The sun and other stars are plasmas.
>The solar wind is a plasma.
>Inside the pixels of modern flat screen plasma televisions there is a ...
>
>Paul D
>
>
>
>
>> Last summer in the alumni chemistry class, we built "grain elevator"
>> tubes. The plastic tubes stand upright and a candle sits on the
>> bottom. The idea is to put powder substances in the tube and see
>> them ignite. I'm having trouble remembering exactly how this worked.
>> I bought Lycopodium, and my first few attempts produced nothing.
>> Then, I dumped teaspoon on the flame, and it was a great fire effect,
>> but the powder got all over everything and it left a huge mess. I
>> also remember being able to put other poweders in the tube and seeing
>> them ignite. So far, everything either does nothing or just puts out
>> the flame. I seem to recall this was a more "graceful" and easy to
>> perform experiment. Does anyone know how to get the maximum benefit
>> from this tube? Is there a way to make corn starch and flour light
>> into a nice fire?
>>
>> Also, my students asked some questions today that I said I'd "research."
>> 1. "does the carbon dioxide in dry ice go directly from being a gas
>> to being a solid?"
>>
>> 2. "do other substances sublimate besides dry ice?"
>>
>> 3. "Is plasma a higher energy state than a gas? Where else does
>> plasma exist besides the outer atmoshpere and in fires?
>>
>> Thanks for your help!
>>
>> -Mike Schulist
>> Miller Creek Middle School
>>
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>>
>>
>
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