MS-240 PVG VENTILATION APPARATUS

Air Convection Currents Experiment, by this Air Convection Apparatus.Airflow is driven by thermal convection.
Comprises aMetal box, with a glass front, has two chimneys. A lit candle is placed under one chimney. Heated air is less dense and rises up in first Glass chimney and from second chimney cooler or less dense air comes down. This is convection current to balance the pressure at bottom of box.
This what proves Gas law that as temperature of Gas increases, its density decreases.