The movement of a solvent through a membrane separating two solutions of different concentrations. The solvent from the side of weaker concentration usually moves to the side of the stronger concentration, diluting it, until the concentrations of the solutions are equal on both sides of the membrane.
We manage Trafalgar Square, one of Londonâs most vibrant spaces in the middle of the city. Find out about the history of this heritage site, its statues and its fountains.
1 After 56 metres turn right onto ST JAMESâS PARK, heading north. 2  After 1/2 kilometre continue straight onto THE MALL, heading north.  Go to the left around THE MALL roundabout, 250 metres on, and then turn off onto TRAFALGAR SQUARE, heading west .