ANSWERS: 3
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Use dry ice it is available in varying quantities. mr Bill
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Sorry no help. I wish I had your class!!!
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It strikes me as odd that a teacher (or anyone else in a position to use such a dangerous substance around children) would not know the answer to this. I remember science teachers having catalogs to order this kind of stuff. If I know the answer, I know a person authorized to demonstrate this stuff to minors sho0uld know.
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