An inflated gas balloon is placed in a sealed jar which is connected to an evacuating pump. What will be observed if the air inside the jar is pumped out? Give a reason justifying your answer.
When air is pumped into the balloon from the sealed jar, the balloon will expand rapidly and burst. Balloon contains gas whose pressure which is more than the atmospheric pressure. This atmospheric pressure opposes the pressure of the gas inside the balloon.
If the air in the jar is pumped out, the pressure exerted by the gas in the balloon will not be opposed. Therefore, the balloon expands rapidly and bursts.
How can you demonstrate the presence of atmospheric pressure experimentally? Illustrate with a diagram.
What are the contact forces? Describe two forces that are contact forces.
What are the changes caused due to force applied on an object?
Describe an activity to observe the relation of pressure and surface area of an object.
