Many practical classroom activities could be carried out, when teaching the concepts of conduction, convection, and radiation. These are simple yet relevant, and would allow students to understand the topic easily. The concept has to be taught in the first 15 minutes of the 1-hour class and then proceed to show some of these demos.
The teacher prepares the materials needed and see to it that safety precautions are observed.
- Prepare three different rods such copper, glass, and iron (or whatever is readily available, except of course plastic rods).
- Place them on a tripod and fix a small nail near one end of each rod using candle wax or Vaseline as ‘glue’. (Make sure the rods are not touching each other).
- Using a bunsen burner, heat the other ends of the rods evenly.
- Record the time it takes for each nail to drop off from the respective rods? (more…)