Today we turned bottles into whistles (blowing air across the top to make a note - a bit beyond the abilities of jr. scientist A). We added and removed water from a bottle to see how it changed the note we heard. As we added water (i.e., less air in the bottle) we got higher notes and as we took away water we got lower notes. We then tried to figure out if other things besides how much air was in the bottle affected the note we got. We took three different types of bottles (a wine bottle, a glass coke bottle, and a plastic water bottle). We filled both the wine bottle and the water bottle all the way with colored water. We then poured enough water out of the wine bottle to fill the coke bottle, emptying out the coke bottle afterwards. We did the same thing with the water bottle. This way, all three bottles had approximately the same volume of air in them. We then made a note on each bottle and got three very different notes! I think I was more excited about this than my son - it seemed to be a bit too advanced for a toddler - but I thought it was really cool. Clearly the shape/size of the bottle and the volume of air in the bottle both matter.
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