Use this apparatus for demonstrating the phenomenon of convection in air and the principle of room ventilation. It consists of an enameled metal box 8″ x 4″ x 4″ , a sliding glass door and two glass chimneys. When the included tea light candle is placed under 1 chimney and a smoldering tape or parchment paper is placed underneath the other chimney, the flow pattern of smoke dramatically illustrates the formation of convection currents. Comes with a Teacher’s Guide and reproducible student handout.