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.
14th to 17th century: Most of the area now occupied by Trafalgar Square was the courtyard of the Great Mews stabling, which served Whitehall Palace. 1812: The architect John Nash began to develop âa new street from Charing Cross to Portland Placeâ. He wanted it to be a cultural space open to the public.