Osmosis

     Osmosis is the movement of water from a high water concentrated place through a semi-permeable membrane to a place of lower concentration of water. Semi-permeable membranes, like the cell membrane, are very thin layers of material which prevents some things to go through while allowing some things to go through. It will allow water molecules to pass through because they are small enough to fit. Molecules such as sucrose, starch, and protein are too big to go through the membrane.

     If there is more solute in a solution, then the lower concentration of water in that solution. The water will then move to that low concentration of water leaving the solute outside the membrane. Then the water will try to bring the solute with it creating, osmotic pressure, because the solute is too big to fit through the membrane. It is also because molecules on both sides are bumping into the membrane. The water molecules will continue to move right-left resulting in left-right. But something could stop that if the bigger molecule were to block a pore in the membrane.