Water is boiled in a flask. Then the flask is removed from the heat and sealed with a rubber stopper. If you now cool the flask by pouring cold water over it, the water in the flask will boil. Why?
On cooling, the air pressure in the flask drops. The boiling point of the liquid depends on the external pressure. As the pressure decreases, the boiling point also decreases.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.