Explain what is the difference between saturated and unsaturated steam? What kind of steam exists in nature?

Let us examine what is the difference between the concepts of saturated and unsaturated steam. Saturated steam is steam that is in a state of thermodynamic equilibrium with the same liquid or solid; unsaturated steam is steam that has not reached this state. That is, in other words, if liquid molecules continue to transform into vapor, then such vapor is not saturated. The state when the rate of transition of molecules from liquid to vapor is, on average, equal to the rate of their reverse transition, is a state of saturated vapor. Both types of steam exist in nature. For example, fog. When steam in the air becomes saturated, dew appears – an example of natural condensation.