Audio Description for "Phosphorus burning in atmosphere of pure oxygen" - A flask with a glass cap, a thin glass cylinder with ladle at the end, rust-colored powder in a small container, and a lighter. Text, www dot periodictable dot r.u. A man taps the powder into the ladle. He clicks the lighter and touches the flame to the powder. Smoke rises as it burns. He takes the cap off the flask, lowers the ladle into it, which triggers a burst of flames. The orange slowly spreads to the bottom of the flask. Smoke rises from the top of the flask. When he pulls the cylinder out of the flask, the burning stops. He puts the cap back on the flask. Smoke continues to rise from the powder in the cylinder ladle. Then he lowers it into the flask again, where it bursts into flames. He covers the flask with the cap. The inside glows orange. Wisps of smoke around the top. Little by little, the orange grows dimmer. The inside of the flask fades to gray.