Editing Floating Soap Bubbles (section)

===Short Explanation===
In this demonstration, we are looking at the difference in density of various gases. ''Density'' is when you divide the mass of something by the volume it takes up. For liquids and gases, a more dense liquid or gas will sink below a less dense one, letting the less dense gas or liquid "float" on top. This is the effect we are seeing with the bubbles in our fish tank!

We first had baking soda and vinegar react in the fish tank, which produces carbon dioxide gas (CO<sub>2</sub>). CO<sub>2</sub> is a heavier gas in our atmosphere, and will sink below the other gases like oxygen and nitrogen in still air. This means that, when the reaction happens in the fish tank, the CO<sub>2</sub> will stay inside the fish tank and push the other gases out. This is why we see the bubbles floating inside the tank when we blow them in as well! The bubbles have an air mix of CO<sub>2</sub>, oxygen, nitrogen, argon, and even some water vapor inside of them. This mix of gases is lighter than pure CO<sub>2</sub>, which allows the bubble to float inside the fish tank!