Get everything you need here: http://www.stevespanglerscience.com/solar-bag.html
Check out the full experiment here: http://www.stevespanglerscience.com/lab/experiments/solar-bag-experiment
A Solar Bag is a long plastic bag made from a very thin plastic and colored black to absorb solar energy. The heated air inside the bag provides buoyancy and causes the bag to float. Over the years, it’s become a very popular science demo for teachers to share with their students as they explore the properties of air.
Want more experiments like this? Check out http://www.stevespanglerscience.com/product/naked-eggs-and-flying-potatoes
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