Students always like lecture demonstrations, and lecturers like to do them. Often, we would like to ask exam questions about a demonstration used in class to illustrate a concept, but hesitate to do so because of some uncertainties associated with lecture demonstrations. Have the principles been thoroughly explained, or have we focused too much on the light, color or other effect which captures students' attentions? Has every student had the same opportunity to see the demonstration? In a large lecture hall, some of the events which are important to understanding what has happened cannot be seen because students are too far away.
The on-line lecture demonstrations attempt to address those issues. A sample demonstration is Figure 6, Combustion of Hydrogen and Oxygen Filled Balloon. Student Menu Main Menu