Reputation: 1571. E-filed in Early February and it took about 7 weeks to get my refund. It might have something to do with the amount as well. I got back $1,500 from the state which is probably more than most people get, so it could have taken longer for the larger payment.
Diffusion and Osmosis. Diffusion. -the process by which molecules spread from areas of high concentration, to areas of low concentration. Concentration gradient - a difference between concentrations in a space. Molecules will always move down the concentration gradient, toward areas of lesser concentration.
Diffusion occurs through cell membranes. Substances that are more concentrated on the outside of the cell than inside the cell tend to move into the cell and vice versa. Some substances move through cell membranes more readily than others. Very small molecules move readily. Nonpolar molecules move more readily than polar molecules.