Pressure Winds Storms and Cyclones — Question 10

Activity to show that air flows from a region of high pressure to a region of low pressure. Materials required: Two similar balloons made of thin rubber, a drinking straw, and some thread. Procedure: Insert one end of the straw into one balloon and secure it with the thread. Inflate the second balloon and insert the free end of the straw into the neck of the inflated balloon, and secure it with the thread. (Ensure that the air from the inflated balloon does not leak.) Observations: Some air moves from the inflated balloon to the uninflated balloon, and the sizes of both balloons change. After some time, both the balloons attain almost the same size, and the flow of air stops. Conclusion: The inflated balloon has higher pressure inside it, and the uninflated balloon has low pressure inside. When the two balloons are connected through a straw, air moves from the high-pressure area (inside the inflated balloon) to the low-pressure area (inside the uninflated balloon).