Hi all. There's a couple of things I have thought about, and I hope you can clarify this for me. 1) In Torricelli's experiment with the tube and mercury, the vacuum-part in the tube has zero pressure (as vacuum always does). Does this mean that it is never possible to "suck" the mercury out of the tube (not unless there is negative pressure)? 2) Please take a look here: http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Pressure/HydroStatic.html [Broken]. At some point, the author explains why different-shaped containers with water have the same pressure at a height h. The author says: "The pressure P is the same on the bottom of each vessel. Why the pressure does not depend upon the shape of the vessel or the amount of fluid in the vessel rests upon three things: a. Pressure is force per unit area and this is not same as the total weight of the liquid in a vessel. b. A fluid can not support its self without a container. Thus the walls of the container exert a pressure on the fluid equal to the pressure of the fluid at that depth. c. The pressure at given level is transmitted equally throughout the fluid to be the same value at that level." I cannot see how part B and part C explain this fact. Why do these 2 points even come into consideration? Isn't part A enough? 3) This is regarding #2. Is it only the pressure at the bottom of the vessels that are equal, or the pressure at any random height h also?