So the more nonpolar a molecule is, the more likely it is to actually dissolve within the hydrophobic core environment of that phospholipid bilayer membrane. So what that means is for a nonpolar molecule, for a small non polar molecule to actually pass across the cell membrane, it basically dissolves inside that cell membrane as it moves across that cell membrane. And to see what we mean by that, let's take a look at the following diagram. So, in diagram A, let's suppose we have a cross section of that phospholipid bilateral membrane. And on both sides, we have an Aqueous environment. Now, remember, in an Aqueous environment, water molecules predominate.