Look at the curve of the dependence of the potential energy of interaction of molecules on the distance between them and make sure that this statement is true.
The transformation of a liquid into vapor at a constant temperature is accompanied by an increase in the potential energy of the interaction of molecules, since the distance between gas molecules is much greater than between liquid molecules.
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.