I created this visualization to recreate what happens inside an internal combustion engine when fuel is injected. The dispersion of droplets of fuel, vegetable oil in this case, shows how the battle between the Reynolds number, inertial forces vs viscous forces, and the Weber number, inertial forces vs surface tension, describe how oil changes into droplets. By using oil and water there is high drag and chemically adverse fluids to create a fast and dramatic separation of fluids that is easier to catch than a fine mist in air.