If you're doing it the old-fashioned way pan and hot plate , a bit of newspaper would be a good idea, too, as I like to leave the top of the pan off and the oil can splatter a bit.
If you decide to go with the pan, oil and hot plate as opposed to air popper , there are a few things I recommend: Put only a few 5 or so kernels in to start. Leave the top of the pan off. Students get a kick out of seeing the popcorn go flying.http://gatsbycapital.co.uk/love-lies-lipstick.php
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It makes it more exciting for you, too -- I always miscount and end up getting scared by the last kernel. Put some newspaper under the hotplate so that oil doesn't get everywhere. The first time I did this, I made a pretty big mess on the lab bench. After the initial "decay" and if your class isn't too large, pop some more with the lid on so that students can enjoy the demonstration too.
Popcorn popping is a great analogy for the spontaneity of radioactive decay. It is impossible to predict which kernel will pop first. If you can, bring in a hotplate, a small pan, oil and some popcorn. Put the oil in the pan with a few kernels of popcorn. Ask the students to predict which will pop first.
What are variables that control whether a kernel of corn will pop? What happens to the kernel of corn when it does pop? Can it go back to the way it was before it popped?
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A quick check of whether the students picked up the ideas of unpredictablitly and irreversibility can be done in one of several ways. A one or two question quiz, with questions that relate to the goals of this exercise.
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