I used to have my students make hot air balloons every year in physical science class when I taught in Arizona. This is the first year I did them in Oregon. Here are a bunch a photos from our flying day. We had to wait a few weeks for a good flying day - I was starting to think we would never fly them. It is very windy where I live and we needed a day with very little or no wind.
The balloons are made out of tissue paper and glue. Most of the balloons fly for 2 or 3 minutes. But, we had two balloons that flew for about 15 minutes and we had to stop timing because they were so high up in the sky we couldn't see them anymore.
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