This document discusses solubility and the different types of solutions. It defines solubility as the maximum amount of solute that can dissolve in a given amount of solvent under certain conditions. There are three types of solutions based on solubility: unsaturated, saturated, and super saturated. For saturated solutions, dissolution continues until dynamic equilibrium is established between dissolved and undissolved solute. Temperature and pressure are two factors that affect solubility. For gases dissolved in liquids, solubility decreases with increasing temperature but increases with increasing pressure.