If Austin passes around a cologne sample during a speech about chemical compounds, which type of presentational aid is being used?

The use of a cologne sample in Austin's speech about chemical compounds represents a sensory presentational aid. This type of aid is designed to engage the audience's senses, such as smell in this case, to create a more immersive experience and enhance understanding of the topic being discussed. By passing around the cologne, Austin allows the audience to directly experience a tangible element related to his subject matter, which can be particularly effective in reinforcing the concepts about the chemical compounds in the cologne.

This method contrasts with visual aids, which primarily rely on sight (like slides or charts), demonstrations that might involve showing how something works without utilizing sensory elements, or handouts that provide written information for later reference without direct sensory engagement during the presentation. Sensory aids engage multiple senses, making the information more memorable for the audience.