Physics Dept. Demonstration Manual

DHT20 - Convection Currents, Air

Objective: Illustrates convection currents.

 

Apparatus:  
  • Glass container with two chimneys
  • Candle, Lab Jack
  • Braided string, matches



Method:

If a candle is lit under one chimney and a smoking string is held over the other chimney, the smoke will be drawn down the cold chimney by the warm air moving up the hot chimney.

Note:

Do not let the smoking string rest against the chimney walls, as the heat melts the plastic chimneys