Presidium believes in using experiments to make understanding of the important concepts of science interesting. With this thought, Presidium Gurgaon recently organised a science activity for the students of grade 4 on the topic expansion of hot and cold air. Student used balloons and a plastic bottle to understand the expansion of hot air and the resultant loss in weight. The behaviour of cold air was also observed as it affected the balloon. It was a great learning experience for the young Presidians.