Saturation, sach uh RAY shuhn, is a term used in chemistry and physics. Chemists say that a solution is saturated when no more of a substance will dissolve in it at the same temperature and pressure. Saturation is also a term used to describe the electronic structure of certain molecules. Saturated molecules do not have double or triple bonds. In saturated organic molecules, a single bond connects each carbon atom to four other atoms (see Bond).