Nine-year-old Marshall's entry for the STEMFest Science Video Competition, "Celebrate the Science in our Lives". Marshall's video celebrates "The Science of GAS!"

Marshall performs two experiments in this video. The first experiment "Elephant Toothpaste" demonstrates the breakdown of H2O2 into H2O and O2 GAS in the presence of a catalyst (activated yeast). The second experiment "Dry Ice Bubble" shows the expansion of CO2 GAS in a bubble as dry ice vaporizes in warm water.

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