We can see that points A, B, C and D are all still coplanar points. Point E is not coplanar with the original four points. But if I pick any group of three of the points, even a group containing point E, those three points will be coplanar. The reason is the statement given above - any three points in 3-dimensional space determine a plane.
Definition of solubility. 1  1 : the quality or state of being soluble. 2  2 : the amount of a substance that will dissolve in a given amount of another substance.
Solubility is defined as how much of a solute will dissolve in a particular amount of a solvent. Most solutes vary with different solvents. In the example used above, sugar was the solute and the solvents were methyl alcohol and water. According to HowStuffWorks, solubility differs greatly depending on the state of matter, temperature and pressure.