&title1=Random motion of water
&title2=Saltwater solutions
&title3=Impermeable wall
&title4=Semipermeable wall

&text1=Water molecules move randomly. On average the water molecules space themselves apart at a certain distance from one another depending on temperature.
&text2=Saltwater contains dissolved materials other than water. The greater the concentration of dissolved components, the greater the salinity of the solution.   
&text3=If we constructed an impermeable wall between two solutions of different dissolved salt concentration, the two solutions would stay separated.
&text4=We could construct a semipermeable wall, like a sieve, that allows water to pass through, but not the larger dissolved atoms A and B.  Click on start to open the semipermeable wall and see what happens.  If you pause the simulation, you will be able to see that the average number of water molecules has increased on the saliter side.