It's that time again. And, again, Kevin's science project was beyond my ability to help. He analyzed the speed of sound under different levels of humidity and pressure which involved two different widths of 30 ft. pvc pipe, a 12 volt battery attached to a high pitched alarm, a computer program to analyze the data, two microphones, a camp stove boiling water, a bike pump, and who knows what else. Thank goodness John knows about that stuff, because with only me to help we would have been doing a baking soda volcano or something. Anyway, they determined that the speed of sound increases when both humidity and air pressure increase. And nothing blew up. (At least nothing important)
cool!
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