If a closed bottle is turned upside down, immersed in water and opened, the water will not fill the bottle. Why?

water will not enter the bottle because there was air in it, which is also outside and does not allow water to enter the bottle.

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.