Activity: The Sun and Shadows
Activity: Expanding Air
Using this experiment in the classroom provides a hands-on learning experience about the behaviour of gases under different temperature conditions. It allows students to directly observe the principle that air expands when heated and contracts when cooled. By engaging in this activity, students can connect theoretical knowledge with real-world observations, reinforcing their understanding through practical application.
I would introduce the activity by discussing the properties of gases and the kinetic theory of matter. After explaining the setup, I would guide students to make predictions about what they expect to happen to each balloon. This encourages critical thinking and hypothesis formulation. Following the observation period, we would reconvene to compare the balloons and discuss the outcomes. This would be an opportunity to delve into why the heated balloon expanded and the cooled balloon contracted, linking these observations to the movement and energy of air molecules.
Finally, I would have students reflect on the importance of controlling variables in experiments. This exercise demonstrates how precise measurements and controls lead to reliable and interpretable results, a fundamental aspect of scientific inquiry. By actively participating in this experiment, students develop a deeper appreciation for the scientific method and the nature of gases.