Create a mechanical model of the interaction of molecules. Take two balls and attach them to the ends of the spring. Change the distance between the balls and observe the change in the force of interaction. Draw conclusions.
The smaller the distance between the balls, the more the forces of interaction affect. At a distance of more than 4 ball diameters, the interaction forces are practically invisible.
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.