If at a temperature of +20 ° C in 1 cu. m of air contains 17 g of steam, such air is called saturated. Why is the air saturated?

Because it cannot absorb more water vapor.

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.