What is Osmosis

Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration. This is done through a semi-permeable membrane. The aim is to have the same concentration of water molecules on each side. This is like if you have lots of people in one room and its very crowded and in the other room are not as many people. You want to be in the not so crowded room Between the rooms are lots of little doors to walk through. So you walk through one of the little doors to the other room. More people will walk through so that there are the same number of people in each room. This is osmosis. The people are the water molecules and the little doors are the semi-permeable membrane.