Schlieren Imaging - Fluid Dynamics of Gasses

This sample video shows CO2 (created by mixing vinegar and baking soda) being poured from one glass into another and back again. The idea here is that, although you can't visually see CO2, it's still there. And in fact, a gas can act like a fluid and be poured from one container to another - just like any other liquid. This is an example of the fluid dynamics of gasses with varying densities.