I understand that a cylinder oriented vertically and bearing a load can be made more resistant to buckling by adding pressure to the (closed) cylinder. For example, an unopened can of soda pop can bear much more load than an opened soda pop can (I found a youtube video showing an unopened can giving way at 6405 N and an opened can giving way at 890 N). Can this beneficial pressure also be provided by filling the cylinder with a fluid? For example, if we have an open cylinder 50m tall and 5m in diameter that needs to support a load, can we increase the load bearing capability of the cylinder by filling it with water (which puts pressure on the walls)? It seems counterintuitive to me that a load in one direction on a material would increase its strength in another direction. What is the relationship between the pressures necessary to strengthen the cylinder and the pressure from a fluid? Is the strengthening pressure much more or much less than the pressure from the fluid?