Water vapor, which is always present in the atmosphere, sometimes in large quantities, sometimes in smaller quantities, is to blame for the appearance of dew. It is clear that in summer, after a hot day, when the evaporation of water from the surface of rivers and lakes, as well as from the surface of the earth, is maximum, the amount of water vapor in the air is also very large. As long as the air temperature is high, everything is fine, but by the morning the temperature drops and the water vapor becomes saturated. From it, moisture particles begin to condense, which are located on the leaves and grass. Moreover, there is no dew on a warmer land.
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.