Classroom demonstrations can be an effective way to help students grasp important concepts and principles. Research shows that instructors can enhance the effectiveness of demonstrations significantly by asking students before the demonstration to predict the outcome. By making a prediction, students develop an expectation based on their initial understanding of the concept. As they observe the demonstration they find out whether their prediction is accurate. If not, the instructor can discuss the incongruities between their initial understanding and what the demonstration actually shows.
Read more at When Students Learn or Don't Learn from Classroom Demonstrations