caption: Part a of the figure shows a vessel having two different concentrations of sugar in water separated by a semipermeable membrane that passes water but not sugar molecules. The sugar molecules are shown as small red color spheres and water molecules as still smaller blue colored spheres. The right side of the solution shows more of sugar molecules represented as more number of red spheres. The osmosis of water molecules is shown toward right. Part b shows the second stage for figure on part a. The osmosis of water is shown toward right. The height of fluid on right is shown as h above the fluid on the left. The back pressure of water is shown toward left.
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