Does air occupy space? Experiment 4 | English | Primary Science

Another interesting experiment to verify whether air occupies space.

Do try it out yourself and have fun :)

[sundaramvenkitarama]

Hello: It is highly commendable that you are getting young minds excited about science through experiment. However, your conclusions are, unfortunately, incorrect. Air is a mixture of different gases. Being a gas, it is highly compressible, unlike liquids, which require tremendous pressure to compress and hence can be assumed to be 'incompressible'.
So, in the first part of the experiment where the young boy couldn't blow up the balloon (without a hole in the bottle) is simply because his lungs couldn't generate enough pressure to compress the air inside the bottle and outside of the balloon. Not because, the air in the cavity is incompressible. As a matter of fact, if you attach a hose from an air compressor, it will easily blow up the balloon inside the bottle ( I wouldn't recommend this due to accidental bursting of the bottle due to over pressure)
In the last part, where, when the air is sucked out, the balloon expanded inside the bottle. I wish you had elaborated how the air around us at 14.7psi atmospheric pressure was trying to rush into the vacuum created by sucking out the air in the bottle and in the process caused the balloon to expand.
A very good effort by the teachers, but need more accurate scientific explanation of what is going on with the observed results.
Good Luck in all your endeavors!