On page 319 of this book, with regards to the conical capillaries: http://books.google.com/books?id=Eo...det&sig=Xr8x61FArV8fK4r0vpR_McJlQIk#PPA319,M1 One particular point that I feel needs further clarifying is that "...and the liquid is drawn in the direction of the of the greatest force per unit of area." It leaves me with a lot of questions. I know water moves up the sides of the tube and pulls the water with it, leaving a concave surface. But why is there a larger concave surface when the radius gets smaller? Why is there a pressure difference at each end of the tubes? Thanks for any help.