Yesterday I thought to do an experiment from class 7th Science Book. So, I remember to do an experiment on how air exerts pressure.
1.Take one Plastic bottle
2.Take hot water
3.Pour the hot water in Bottle
4.Wait for few sec & remove the water from the bottle
5.Close the lid of the bottle tightly
6.Now put some Cold / Tap water on bottle
Here is the link for video :- https://drive.google.com/file/d/1CYAlIOA5GByZuuVkb-FFs6HixrIe65hc/view?usp=sharing
What will Happen and why
The bottle will shrink, but the question arises why the bottle shrinks.
Because, when we put hot water inside the bottle, air is occupied with some amount of water vapours and when suddenly cold water is poured on the bottle, water vapours converts into water droplets by the process of condensation. Now, what will happen, as water vapours are converted into water, amount of air and air pressure decreases compared to the amount and pressure of air outside the bottle. To maintain the pressure and amount of air in bottle, it shrinks.
If you have any doubt Regarding this topic, please reply