Fire tornadoes (also called fire whirls) form when intense heat and turbulent airflow organize into a rotating column. At their core, these structures are governed by fluid dynamics: rising hot air creates a low-pressure region, drawing in surrounding air that can begin to rotate under the right boundary conditions. Angular momentum concentrates the flame into a vertical vortex, increasing temperature and combustion efficiency. Now layer in chemistry. If you introduce vaporized or finely dispersed metal salts into the flame, the color shifts dramatically. This happens because thermal energy excites electrons in the metal ions to higher energy states. As those electrons relax back down, they emit photons at specific wavelengths—producing characteristic emission spectra. Examples: * Sodium compounds → intense yellow (~589 nm) * Copper compounds → blue-green (~510–520 nm) * Potassium compounds → lilac (~404–420 nm) * Strontium compounds → deep red (~650 nm) * Barium compounds → green ...